Microsoft Surface Hub 2S Installation guide

Surface Hub 2S Technical FAQ
Microsoft confidential –internal/partner use only

Surface Hub 2S coming soon; Pre-release products shown; products and features subject to regulatory certification/approval, may
change, and may vary by country/region. This documentation is an early release of the final documentation, which may be changed
prior to final commercial release and is confidential and proprietary information of Microsoft Corporation. This document is provided
for internal and/or partner use, for informational purposes only. Microsoft makes no warranties, either express or implied, in this
document.
© 2019. Microsoft Corporation. All rights reserved

Introduction............................................................................................................................................................................................1
Surface Hub 2S tech specs................................................................................................................................................................1
Pen tech specs...............................................................................................................................................................................2
Camera tech specs.......................................................................................................................................................................3
Battery tech specs........................................................................................................................................................................3
Device........................................................................................................................................................................................................4
What are the major system components? .........................................................................................................................4
What ports and physical buttons are on Hub 2S? ..........................................................................................................5
Can I use any USB port for TouchBack?..............................................................................................................................8
I have multiple USB-A devices I want to attach to the Hub 2S. Can I use a USB-A Hub? .............................8
Will this affect TouchBack functions? ..........................................................................................................................8
Can I use a USB-C Hub?....................................................................................................................................................8
Will this affect my Connect sessions, using this same USB-C port?................................................................8
My laptop does not have a USB-C port, can I use a USB-A to USB-C cable to send video to Hub 2S? ...9
What devices can I connect via Bluetooth?.......................................................................................................................9
Can I connect a Bluetooth speaker to the Hub 2S? .......................................................................................................9
Can I connect a Bluetooth microphone to the Hub 2S?...............................................................................................9
Will Teams on Hub 2S support IM? ......................................................................................................................................9
Is Hub 2S Teams certified? .......................................................................................................................................................9
Does Hub 2S support proximity-based meeting join as implemented in Microsoft Teams?........................9
Does Hub 2S support Autopilot?...........................................................................................................................................9
When will cloud recovery imaging be ready and what can we recommend at this time? ...........................10
When will Hub 2S be TAA compliant?...............................................................................................................................10
If another party is using Skype will Hub 2S support that? ........................................................................................10
Does Hub 2S Teams client support inviting all participants to Microsoft Whiteboard? ...............................10
Is there a limit to how many people can collaborate on whiteboards? ...............................................................10
Is Windows Hello supported on Hub 2S?.........................................................................................................................10
Can only one person sign in at a time?.............................................................................................................................10
Differences with Hub 1.....................................................................................................................................................................10
How does Hub 2S compare with the first-generation Surface Hub (Hub 1)?....................................................10
On Hub 1, the Connect App was limited to 1080p. Will this also be a constraint for Hub 2S?..................13
The aspect ratio has changed, do the ISV apps have to be revisited? .................................................................13

Does Hub 2S support Cortana in meetings?...................................................................................................................13
Why is there no 3.5 mm audio in? ......................................................................................................................................13
Why is there no 3.5 mm audio out? ...................................................................................................................................13
Why is there no USB-B?...........................................................................................................................................................13
Does Miracast support 4K video?........................................................................................................................................13
Why is there no VGA guest video input? .........................................................................................................................13
Pen............................................................................................................................................................................................................14
How many pens are included with Hub 2S?....................................................................................................................14
Does the pen have a replaceable battery?.......................................................................................................................14
Will the pen work if Bluetooth is disabled?.....................................................................................................................14
Do you need to pair the pen to the Hub 2S? .................................................................................................................14
Is the pen covered under the Hub 2S warranty? ...........................................................................................................14
Will the pen work without a battery?.................................................................................................................................14
Does the Hub 2S pen support tilt?......................................................................................................................................14
How many levels of pressure are available on the pen? ............................................................................................14
Can the Hub 2S pen tip be replaced? ................................................................................................................................14
Can multiple pens be used on the device at the same time? ..................................................................................14
Camera....................................................................................................................................................................................................14
Why is there only one camera? ............................................................................................................................................14
Can the Hub 2S camera be plugged into any of the four USB-C ports on the display? ...............................15
Will the Hub 2S camera automatically adjust perspective when connected to USB-C ports on the
display?...........................................................................................................................................................................................15
Is the Hub 2S camera covered under the Hub 2S warranty?....................................................................................15
Battery.....................................................................................................................................................................................................15
Does Surface Hub 2 ship with a mobile battery? ..........................................................................................................15
Will the mobile battery be available from day one?....................................................................................................15
Does the battery require a USB-A connection for management?..........................................................................15
How long will the mobile battery last?..............................................................................................................................15
Setup & maintenance.......................................................................................................................................................................15
What are the serviceable components?............................................................................................................................15
Can I place Surface Hub 2S horizontally on a flat table? ...........................................................................................16
How many persons are required to install?.....................................................................................................................16
Does Hub 2S use an official VESA mounting standard?.............................................................................................16

How do I clean the display?...................................................................................................................................................17
Will Hub 2S have a dead pixel policy before the warranty applies?......................................................................17
What are minimum and maximum room temperatures for Hub 2S?..................................................................17
Managing Surface Hub ....................................................................................................................................................................17
Can I manage Surface Hub 2S remotely?.........................................................................................................................17
Power Management..........................................................................................................................................................................18
What are the power states for Hub 2S?............................................................................................................................18
Is Hub 2S Energy Star certified? ...........................................................................................................................................18
Can connecting a USB-A or USB-C hub impact power delivery to the peripheral? ........................................18
How does Surface Hub 2S comply with power efficiency standards? ..................................................................18
Does Surface Hub 2S require additional cooling? ........................................................................................................18
What motion detector capabilities are included? .........................................................................................................18
Third party accessories.....................................................................................................................................................................19
Does Surface Hub 2S ship with a wall mount?...............................................................................................................19
Can you customize the stand color? ..................................................................................................................................19
Does Surface Hub 2S ship with a mobile stand?...........................................................................................................19
Are the stand, battery, and Hub sold separately?.........................................................................................................19
How much will the individual pieces cost? ......................................................................................................................19
Is the battery third party or first party?.............................................................................................................................19
Can you buy as a bundle? How?..........................................................................................................................................19
Tested devices .....................................................................................................................................................................................19
Conference cameras .........................................................................................................................................................20
Conference phones...........................................................................................................................................................20
Installed audio systems ...................................................................................................................................................21
Learn more............................................................................................................................................................................................21

1
Microsoft confidential internal and/or partner use only
Introduction
This document includes the latest technical specifications for Microsoft Surface Hub 2S, a summary of how
Surface Hub 2S compares with Surface Hub 1, and answers to questions that customers may ask. It will
continue to be updated in response to feedback from customers and the field.
Surface Hub 2S tech specs
Item
Details
Size
29.2" x 43.2" x 3.0” (741 mm x 1097 mm x 76 mm)
Weight
61.6 lbs. (28 kg)
Resolution
3840 x 2560
Display
PixelSense Display, 3:2 aspect ratio, 10-bit color, 15.5mm border, anti-glare, IPS
LCD
Compute
Quad-core 8th Generation Intel Core i5 processor, 8 GB RAM, 128 GB SSD1
Graphics
Intel UHD Graphics 620
Wireless
Wi-Fi 5 (IEEE 802.11 a/b/g/n/ac compatible) Bluetooth Wireless 4.1 technology
Miracast display
USB-A
Mini-DisplayPort 1.2 video output
RJ45 gigabit Ethernet (1000/100/10 BaseT)
HDMI video input (HDMI 2.0, HDCP 2.2 /1.4)
USB-C with DisplayPort input
Four USB-C (on display)
Sensors
Doppler occupancy sensor
Accelerometer
Gyroscope
Audio/Video
Full-range, front facing 3-way stereo speakers
Full band 8-element MEMS microphone array
Microsoft Surface Hub 2 Camera, 4K, USB-C connection, 90-degree HFOV
Pen
Microsoft Surface Hub 2 Pen (active)
Software
Windows 10
Microsoft Teams for Surface Hub2
Skype for Business
Microsoft Whiteboard
1
System software uses significant storage space. Available storage is subject to change based on system software
updates and apps usage. 1 GB= 1 billion bytes. See Surface.com/Storage for more details.
2
Software license required for some features. Sold separately.

2
Microsoft confidential internal and/or partner use only
Item
Details
Microsoft Office (Mobile)
Microsoft Power BI2
Connections
USB-A
Mini-DisplayPort video output
RJ45 Gigabit Ethernet
HDMI video input
USB-C with DisplayPort input
Four USB-C (on display)
Exterior
Casing: Precision machined aluminum with mineral-composite resin
Color: Platinum
Physical Buttons: Power, Volume, Source
What’s in the box
One Surface Hub 2S
One Surface Hub 2 Pen
One Surface Hub 2 Camera
2.5m AC Power Cable
Quick Start Guide
Warranty
1-year limited hardware warranty
Pen tech specs
Item
Details
Dimensions
5.94" x 0.64" x 0.56” (151 mm x 16.3 mm x 14.3 mm)
Weight
0.09 lbs. (41g)
Buttons
Barrel button and tail eraser
Color
Grey
Connector type
Bluetooth 4.0
Compatibility
Surface Hub 2S
Surface Book 23
Surface Book
Surface Studio 23
Surface Studio3
Surface Laptop
Compatibility
Surface Go
Surface Go with LTE Advanced
3
Tilt functionality is currently available

3
Microsoft confidential internal and/or partner use only
Item
Details
Surface Pro 63
Surface Pro (5th Gen)3
Surface Pro (5th Gen) with LTE Advanced3
Surface Pro 4
Surface Pro 3
Surface 3
3Tilt functionality is currently available
Camera tech specs
Item
Specification Details
Dimensions
2.26" x 2.18" x 1.65” (57.5 mm x 55.3 mm x 42 mm)
Weight
0.12 lbs. (87.8 g)
Connection
USB-C (with magnetic attach)
Resolution
4K
Field of View
90-degree HFOV
Imaging Features
Anti-flicker
Face-based auto exposure
Up to 30 frames per second
Battery tech specs
Item
Details
Dimensions
11 x 17 x 5 inches (282 x 432 x 127 mm)
Weight
~30 lbs. (13.6 kg)
Connection
AC input/DC output & USB-A
Voltage
48 V DC
Capacity
8.2 Ah
Energy
403Wh (~10x Pro6)
Power Delivery
387 W
Battery Technology
Li-Ion NMC523
Charger
600 W
Charging Time
0 to 100 percent in ~1.5 hours
Run Time
2 hours nominal
AC output
88-265 V AC, 50-60Hz, Max 8 A/400 W
DC output
24 V DC, Max 16.2 A /387 W

4
Microsoft confidential internal and/or partner use only
Device
What are the major system components?
There are two major “brains” in the system as described in the table below.
Component
Functionality
Video board
•Produces the image on the LCD display.
•Provides an audio/video connection path
to/from the compute module.
•Provides video scaling to support external
video sources.
•Performs color correction and calibration.
•Responsible for power management,
including occupancy sensors and device
power states.
•Monitors and manages all thermal sensors
throughout the device.
•Performs internal diagnostics.
•Captures diagnostics, error logs and
telemetry for all components not
connected to the compute module.
•Controls the behavior of keypad buttons.
•Provides an on-screen display for control
of video source, brightness, and volume.
Compute module
•Connects to and controls all USB devices.
•Provides videoboard interconnections for
USB, DisplayPort, HDMI, PCIe.
•Provides Ethernet access via wired and
wireless interfaces.
•Provides the on-screen audio/video
content.
•Ingests audio/video provided by external
sources.
•Allows video to be passed directly to the
videoboard (bypassing the ingest process)
for scenarios in which an external source
is HDCP encrypted or is beyond the
capability of the ingest subsystem.

5
Microsoft confidential internal and/or partner use only
Component
Functionality
•Provides digital audio output for
accessibility and room audio systems
respectively (USB dongle support only).
What ports and physical buttons are on Hub 2S?
Figures 1-4 depict the location of ports and physical buttons.
Figure
1.
Front facing and underside view of I/O connections and physical buttons

6
Microsoft confidential internal and/or partner use only
Table 1. Surface Hub 2S port and keypad component reference
Key
Component
Description
Key
parameters
①
USB C
USB 3.0 Port
•Use as a walk-up port for plugging in peripherals such as thumb-
drives. Guest ports are located on each side of the device (4).
•
NOTE: This is the recommended port for connecting an external
camera. Additional camera mount features are incorporated into the
design to help support retention of attached cameras.
•NOTE: TouchBack and video ingest are not supported on these ports.
Type C
•15 W Port
(5V/3A)
②
AC power
100-240V input
Connect to standard AC power and Surface Hub 2S will auto switch to
the local power standard such as110 volts in the US and Canada or
220 volts in the UK.
NOTE: When the AC cord is plugged in, the system remains in an off
state in which only the system management controller (SMC), real
time clock (RTC), and keypad are running.
IEC 60320
C14
③
DC power
24V DC input port
Use for connecting to mobile battery.
Xbox1 Dual
barrel to
Anderson
connector
④
Ethernet
1000/100/10 BaseT
Use for providing a continuous connection in a corporate
environment and related scenarios requiring maximum stability or
capacity.
RJ45
⑤
USB-A
USB 3.0 Port
Use as a walk-up port for plugging in peripherals such as
thumb-drives.
Type A
7.5 W Port
(5V/1.5A)
⑥
USB-C
USB 3.0 Port
Use as a walk-up port for connecting external PCs and related devices
or plugging in peripherals such as thumb-drives.
NOTE: This is the recommended video input port, supporting both
TouchBack and InkBack.
Type C
18 W Port
(5V/3A,
9V/2A)
⑦
HDMI in
HDMI 2.0, HDCP 2.2 /1.4
Use for multiple scenarios including HDMI-to-HDMI guest input.
Standard
HDMI

7
Microsoft confidential internal and/or partner use only
Key
Component
Description
Key
parameters
⑧
Mini
DisplayPort
out
DisplayPort 1.2 output
Use for video-out scenarios such as mirroring the Surface Hub 2S
display to a larger projector.
Mini
DisplayPort
⑨
Source
Use to toggle among connected ingest sources —external PC, HDMI,
and DisplayPort modes.
n/a
⑩
Volume
Use +/- to adjust audio locally on the device.
NOTE: When navigating to the brightness control, use +/- on the
volume slider to control display brightness.
n/a
⑪
Power
Power device on/off.
Use also to navigate display menus and select items.
n/a
Figure
2.
Rear facing view of wireless, audio, & related components

8
Microsoft confidential internal and/or partner use only
Figure
3.
Expanded view of compute module I/O components
Figure
4.
Underside view of source, volume, & power buttons
Can I use any USB port for TouchBack?
TouchBack functionality is only available via the USB-C port located at the bottom of the compute
module.
I have multiple USB-A devices I want to attach to the Hub 2S. Can I use a USB-A Hub?
Yes.
Will this affect TouchBack functions?
No.
Can I use a USB-C Hub?
Yes.
Will this affect my Connect sessions, using this same USB-C port?
No.

9
Microsoft confidential internal and/or partner use only
My laptop does not have a USB-C port, can I use a USB-A to USB-C cable to send video
to Hub 2S?
No, but if the laptop has an HDMI port, you can use an HDMI-USB-C cable. You can also use HDMI to
HDMI, MiniDP to HDMI or MiniDP to USB-C.
What devices can I connect via Bluetooth?
•Mice
•Keyboards
•Headsets
•Microphones
•Speakers
NOTE: After you connect a Bluetooth headset or speaker, you might need to change the default
microphone and speaker settings. For more information, refer to Local management for Surface Hub
settings
Can I connect a Bluetooth speaker to the Hub 2S?
Yes.
Can I connect a Bluetooth microphone to the Hub 2S?
Yes.
Will Teams on Hub 2S support IM?
No, but if you are logged on to the device, you can use available Windows store apps.
Is Hub 2S Teams certified?
Hub 2S is pending certification.
Does Hub 2S support proximity-based meeting join as implemented in Microsoft
Teams?
Not at this time.
Does Hub 2S support Autopilot?
Not at this time.

10
Microsoft confidential internal and/or partner use only
When will cloud recovery imaging be ready and what can we recommend at this time?
Cloud recovery will be ready at GA release. Until then, the alternate recovery method is USB bare metal
reset (BMR).
When will Hub 2S be TAA compliant?
Compliance with the Trade Agreements Act (TAA) is pending.
If another party is using Skype will Hub 2S support that?
Yes, Hub 2S switches from Teams to Skype to accommodate this scenario.
Does Hub 2S Teams client support inviting all participants to Microsoft Whiteboard?
Yes.
Is there a limit to how many people can collaborate on whiteboards?
The Microsoft Whiteboard app does not impose a limit.
Is Windows Hello supported on Hub 2S?
No.
Can only one person sign in at a time?
Yes.
Differences with Hub 1
How does Hub 2S compare with the first-generation Surface Hub (Hub 1)?
Specifications
Microsoft Surface Hub 55”
Microsoft Surface Hub 2S 50”
Size
•31.75” x 59.62” x 3.38”
•(806.4mm x 1514.3mm x
85.8mm)
•29.2" x 43.2" x 3.0"
•(741 mm x 1097 mm x 76 mm)
Weight
•105 lbs. (48 kg)
•61.6 lbs. (28 kg)
Resolution
•16:9 1920 x 1080 @ 120 Hz
•3:2 3840 x 2560 @ 60 Hz
Compute
•4th Gen Intel i5
•8 GB RAM
•128 GB SSD
•Quad-core 8th Generation Intel
Core i5 processor
•8 GB RAM
•128 GB SSD
GPU
•Intel HD 4600
•Intel UHD Graphics 620
Network
•Wi-Fi (802.11 a/b/g/n/ac)
•Ethernet 1Gbps
•Bluetooth 4.0 low energy
•Wi-Fi 5 (IEEE 802.11 a/b/g/n/ac)
•Ethernet 1Gbs
•Bluetooth Wireless 4.1 technology

11
Microsoft confidential internal and/or partner use only
Specifications
Microsoft Surface Hub 55”
Microsoft Surface Hub 2S 50”
•NFC reader
•Miracast enabled
•Miracast Display
Camera
•Two 1080p front-facing
cameras
•100-degree horizontal field of
view
•One Surface Hub 2S Camera
•90-degree horizontal field of view
4K, USB-C connection
•Anti-flicker, face-based auto
exposure, up to 30 frames per
second
Audio
•4-element microphone array
•Two front-facing stereo
speakers
•Full band 8-element MEMS
microphone array. (MEMS
microphones respond equally to
sounds coming from any direction.)
•Full range front facing 3-way stereo
speakers
Accessories
•Two powered, active pens
•One wireless all-in-one
keyboard
•One Microsoft Surface Hub 2 Pen
(active)
•One Surface Hub 2 Camera
Sensors
•Two passive infrared presence
sensors
•Ambient light sensors
•Doppler occupancy sensor
•Accelerometer
•Gyroscope
Power saving feature
•S3 Sleep
•Connected Standby
Ports
•Four USB-A (Keyboard, Side,
2x Aux)
•USB-B (TouchBack)
•DisplayPort video input
•HDMI video input
•VGA + audio input (3.5mm)
•DisplayPort video output
•Audio output (3.5.mm)
•RJ45 Gigabit Ethernet
•Serial Port
•USB-A
•Mini-DisplayPort video output
•HDMI video input
•USB-C with DisplayPort input
•Four USB-C (on display)
•RJ45 Gigabit Ethernet
Other features
Microsoft Surface Hub 55”
Microsoft Surface Hub 2S
PEN battery/charging
•Non-removable
•Rechargeable via pen dock
•Removable AAA battery
•Customer replaceable
Multiple pen use
•Three pens
•One pen
Pen dock
•Located on each side of
display
•Pen uses magnetic attachment
available on all 4 sides of bezel
Pen button and eraser
•Active pen, no button, tail
eraser
•Active pen, barrel button, tail
eraser
•Connector type –Bluetooth
4.0

12
Microsoft confidential internal and/or partner use only
Other features
Microsoft Surface Hub 55”
Microsoft Surface Hub 2S
Wireless keyboard
•Keyboard included
•Keyboard not included
Speakers/microphone
•Located in wings
•Integrated into display
USB TouchBack port
•USB-B
•USB-C
Wired connect inputs
•DisplayPort
•HDMI
•VGA +3.5 mm audio input jack
•HDMI+USB-C (for TouchBack)
•USB-C (video, audio,
TouchBack)
Bypass mode via source selection
•DisplayPort
•HDMI
•VGA
•HDMI
•DisplayPort (via USB-C
connection)
Bypass mode TouchBack
•Via USB-B connection
•Not available
DisplayPort output
•Standard DisplayPort
connection
•Mini DisplayPort connection
DisplayPort image (duplicate)
•Always enabled
•Image available when source
is changed to DisplayPort,
HDMI, or VGA
•Use keyboard command:
Win+P > Duplicate
•No image available when
source is changed to
DisplayPort or HDMI
Audio output
•3.5 mm audio jack
•USB-A or USB-C (via adapter
or external converter cables)
Replacement PC Mode (disable
internal PC)
•Available via switch on
videoboard
•Not available
Physical buttons
•Power, volume, source,
brightness
•Power, volume, source
Customer replaceable SSD
•128 GB 2.5” SATA SSD and
sled
•128 GB M.2 NVMe
•Located within compute
module
•NOTE: NVMe is a protocol that
lets data be read and written
via PCI-E)
Replaceable compute module
•Requires removal from
stand/wall and disassembly of
device
•Removal from wall/stand not
required
•Cartridge design: single screw,
removed from bottom of
device
OS image recovery methods
•Reset from OS (via settings)
•Cloud recovery
•Surface Hub recovery tool
•Physical SSD replacement
•Reset from OS (via settings)
•Cloud recovery tool
•Bare metal reset
•Physical M.2 replacement
Room controller
•Via serial port, via ASCII
controls
•None for Hub 2S (planned for
future release).

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Microsoft confidential internal and/or partner use only
Other features
Microsoft Surface Hub 55”
Microsoft Surface Hub 2S
Remote Surface Hub management
•Policy CSP support (see
Manage settings with an
MDM provider)
•Equivalent policy CSP support
BIOS/UEFI access
•Not available
•Matches other Surface product
UEFI access with the difference
that Secure Boot cannot be
disabled
Mounting options
•Wall
•Rolling
•Floor-supported
•Wall stand
•Wall
•Mobile cart
AC power rocker (on/off switch)
•Next to power inlet
•Not available. Must physically
remove power plug
On Hub 1, the Connect App was limited to 1080p. Will this also be a constraint for Hub
2S?
No
The aspect ratio has changed, do the ISV apps have to be revisited?
No they should scale.
Does Hub 2S support Cortana in meetings?
No.
Why is there no 3.5 mm audio in?
This functionality is now supported using USB-A or USB-C (via adapters or converter cables).
Why is there no 3.5 mm audio out?
This functionality is now supported using USB-A or USB-C (via adapters or converter cables).
Why is there no USB-B?
This functionality is now supported using USB-A or USB-C.
Does Miracast support 4K video?
No
Why is there no VGA guest video input?
This functionality is now supported using USB-C.

14
Microsoft confidential internal and/or partner use only
Pen
How many pens are included with Hub 2S?
Surface Hub 2S ships with one pen.
Does the pen have a replaceable battery?
Yes, the pen uses AAA batteries.
Will the pen work if Bluetooth is disabled?
Yes.
Do you need to pair the pen to the Hub 2S?
No.
Is the pen covered under the Hub 2S warranty?
Yes.
Will the pen work without a battery?
No.
Does the Hub 2S pen support tilt?
Yes.
How many levels of pressure are available on the pen?
There are 1024 levels of pressure.
Can the Hub 2S pen tip be replaced?
The tip can be removed; however, currently there is no available pen tip SKU.
Can multiple pens be used on the device at the same time?
Not at precisely the same time.
Camera
Why is there only one camera?
Surface Hub 2S is equipped with a 4K camera that captures the room and conference participants in a full
field of view.

15
Microsoft confidential internal and/or partner use only
Can the Hub 2S camera be plugged into any of the four USB-C ports on the display?
Yes.
Will the Hub 2S camera automatically adjust perspective when connected to USB-C
ports on the display?
No, this requires a 2 mm Allen key to turn the lens.
Is the Hub 2S camera covered under the Hub 2S warranty?
Yes.
Battery
Does Surface Hub 2 ship with a mobile battery?
No, the APC Mobile Battery for Surface Hub 2 is sold separately and consists of a lithium-ion battery
system.
Will the mobile battery be available from day one?
No, final availability is pending.
Does the battery require a USB-A connection for management?
Management of the battery is not supported in this manner.
How long will the mobile battery last?
Battery life estimates are TBD pending completion of testing.
Setup & maintenance
What are the serviceable components?
The PC cartridge, as shown in the figure below, is removable for servicing or upgrading; for example if any
of the parts fail, the cartridge can be removed and serviced or replaced.