Tobii Pro Glasses 3 User manual

Pro Glasses 3
User Manual

Pro Glasses 3 User Manual
Version 1.1
10/2020
All rights reserved.
Copyright © Tobii Pro AB (publ)
The information contained in this document is proprietary to
Tobii Pro AB. Any reproduction in part or whole without prior written
authorization by Tobii Pro AB is prohibited.
Products that are referred to in this document may be either trade-
marks and/or registered trademarks of the respective owners. The
publisher and the author make no claim to these trademarks.
While every precaution has been taken in the preparation of this
document, the publisher and the author assume no responsibility for
errors or omissions, or for damages resulting from the use of
information contained in this document or from the use of programs
and source code that may accompany it. In no event shall the
publisher and the author be liable for any loss of profit or any other
commercial damage caused or alleged to have been caused directly
or indirectly by this document.
Content subject to change without notice.
Please visit Tobii Pro Connect at connect.tobiipro.com for updated
versions of this document.

Pro Glasses 3 User Manual v1.1 3
Table of Contents
1 Introduction 6
1.1 Intended use 6
1.2 Documentation 6
1.3 Symbols used in this document 7
2 System Requirements 8
2.1 Tobii Pro Glasses 3 controller application requirements 8
2.2 Additional software options 8
3 Safety 9
3.1 General precautions 9
3.2 Usage warning 9
3.3 Emergency 10
3.4 Child warning 10
3.5 Infrared warning 10
3.6 Photosensitivity/epilepsy warning 10
3.7 Mechanical shock 10
3.8 Bending 11
3.9 Do not open or disassemble 11
3.10 Connectors 11
3.11 Head unit cable 11
3.12 Environment 11
3.13 Component connection safety 12
3.14 Battery safety 12
3.15 Wireless warning 13
3.16 Transportation 13
3.17 Accessories 13
3.18 Cleaning 13
3.19 California Proposition 65 warnings 14
4 Overview of Tobii Pro Glasses 3 15
4.1 Pro Glasses 3 packages 15
4.2 What’s in the box 15
4.3 Optional accessories 17
4.4 System components 18
4.5 Head unit 18
4.6 Recording unit 20
4.6.1 Recording unit status LEDs 21
4.7 Pro Glasses 3 controller application 22
4.7.1 Pro Glasses 3 controller menu 22
4.7.2 Record 23
4.7.3 View recordings 24
5 Set up Pro Glasses 3 25
5.1 Prepare the head unit 25
5.1.1 Attach a different nose pad 25
5.1.2 Remove the nose pad 26
5.1.3 Prepare the Corrective Lenses (optional) 26
5.2 Prepare the recording unit 26

Pro Glasses 3 User Manual v1.1 4
5.2.1 Insert/remove the battery 26
5.2.2 Charge the battery using the battery charger 28
5.2.3 Charge the Pro Glasses 3 recording unit battery using the USB charger 29
5.2.4 Change a SD card in the recording unit 30
5.2.5 Connect the head unit cable 30
5.2.6 Update the Pro Glasses 3 firmware 31
5.3 Install and Update Pro Glasses 3 controller application 32
5.3.1 Download and install Pro Glasses 3 controller application for Windows 32
5.3.2 Download and install Pro Glasses 3 controller application for Android 32
5.3.3 Update Pro Glasses 3 controller application 33
5.4 Connect the Pro Glasses 3 system 33
5.4.1 Connect via Wi-Fi (access point) 33
5.4.2 Connect using a cable (peer-to-peer) 34
6 Operation 35
6.1 Prepare the Pro Glasses 3 system 35
6.1.1 Fit the Pro Glasses 3 head unit 35
6.1.2 Turn the Pro Glasses 3 Eye Tracker on and off 36
6.2 Make a recording 37
6.2.1 Enter the participant name 37
6.2.2 Calibration 38
6.2.3 What calibration does 40
6.2.4 Troubleshoot calibration 40
6.2.5 Start the recording 40
6.2.6 End the recording 41
6.3 Work with recordings 41
6.3.1 Locate and play a recording 41
6.3.2 Delete a recording 42
6.4 Additional operations 43
6.4.1 Display the Pro Glasses 3 recording unit properties 43
6.4.2 Pro Glasses 3 API 44
7 Product Care 45
7.1 Operational environment 45
7.2 Transportation 45
7.3 Storage 45
7.4 Cleaning 45
7.5 Disposal of the eye tracker 46
8 Technical Specifications 47
8.1 Eye tracking 47
8.2 Head unit 47
8.3 Recording unit 47
8.4 Corrective Lenses (optional) 48
8.5 Pro Glasses 3 controller application system requirements 48
01 Compatible Android devices 48
9 Compliance Information 49
9.1 Australia and New Zealand compliance 49
9.2 China compliance 49
9.3 EU Compliance 49
9.3.1 Conformity with EU directives 49

Pro Glasses 3 User Manual v1.1 5
9.3.2 CE marking 49
9.3.3 WEEE marking 49
9.4 Japan compliance 49
9.5 Korea compliance 50
9.6 United States and Canada compliance 50
9.6.1 FCC interference and Industry Canada statement 50
9.6.2 ETL compliance 50
9.6.3 UL compliance 51
9.7 Electromagnetic compatibility compliance 51
9.8 Safety compliance 51
Appendix A Support, Learning Center, and Warranty 52
A1 CustomerSupport 52
A1.1 Get help online 52
A2 Learning Center 52
A3 Warranty information 52
Appendix B Limitations and considerations 53
B1 Intended use 53
B2 Light conditions 53
B3 Eyelashes 53
B4 Droopy eyelids 53
Appendix C Sync Port 54
C1 Sync-out 54
C2 Sync-in 54
Appendix D Calibration Target 55

Pro Glasses 3 User Manual v1.1 6
1 Introduction
Tobii Pro Glasses 3 is designed to enable easy, precise, and efficient collection of eye tracking data
in a wide variety of research scenarios. The discreet, ultra-lightweight design ensures natural beha-
vior and research validity in both qualitative and quantitative situations. Accurate data and robust eye
tracking capabilities can be relied on in uncontrolled situations and real-world environments.
This document describes how to use Pro Glasses 3 and Tobii Pro Glasses 3 controller application.
1.1 Intended use
Tobii Pro Glasses 3 is a wearable eye tracker for academic, commercial, and industrial use for the
capture of truly objective and deep insights into human behavior in a real-world environment. Pro
Glasses 3 is designed to capture what the wearer is viewing while providing robust and accurate
eye-tracking data. The complete Pro Glasses 3 product package consists of a head unit, a recording
unit, and the Tobii Pro Glasses 3 controller application installed on an external device.
The product should only be used as described in the Pro Glasses 3 User Manual. Please read the
User Manual and other supplied documentation thoroughly before using the product.
This product is continuously being developed and refined. Visit Tobii Pro Connect for the most
recent specifications for the application and for the latest version of this document.
1.2 Documentation
Further documentation is available for viewing and download at Tobii Pro Connect.

Pro Glasses 3 User Manual v1.1 7
lPro Glasses 3 Product Description
lPro Glasses 3 Product Description
lPro Glasses 3 Quick Start Guide
lPro Glasses 3 Safety and Compliance
lPro Glasses 3 Developer Guide
1.3 Symbols used in this document
Three different symbols are used in this document:
The Information symbol means something is important or needs special attention.
xxxxxxxxx
The Tip symbol denotes additional information that can make a process or function
easier.
The Warning symbol means there is a possible risk of harm if the warning is ignored.

Pro Glasses 3 User Manual v1.1 8
2 System Requirements
2.1 Tobii Pro Glasses 3 controller application requirements
Operating sys-
tem
Windows® 10 Android™ 10, 9
Processor 6th Generation Intel® Core™ i5 (Dual core) or equi-
valent
Snapdragon 835 or equi-
valent
Memory 8 GB RAM 6 GB RAM
There are many variants of Android devices, with a wide range of different hardware configurations.
While most devices meeting the minimum requirements should work with the Glasses 3 controller
application, we cannot guarantee it. Below you will find a table listing the Android devices we have
tested and verified will work.
Manufacturer Device
Samsung Galaxy Tab S5e
Samsung Galaxy S10
Google Pixel 4 XL
2.2 Additional software options
Pro Lab
tobiipro.com/product-listing/tobii-pro-lab/
Pro Lab is a comprehensive research soft-
ware platform for eye tracking designed to
meet the highest demands on different
research scenarios with exact timing accur-
acy. This software offers an efficient work-
flow, making it easy to design experiments,
record data, analyze and visualize eye track-
ing data, and to sync this data with other bio-
metric data streams.
Pro SDK
tobiipro.com/product-listing/tobii-pro-sdk/
Pro SDK offers a broad set of tools that
makes it simple to develop a variety of niche
applications or scripts across multiple plat-
forms, using a wide range of programming
languages. This SDK gives the researcher
access to the full set of relevant gaze data
streams, such as 3D eye coordinates, raw
data, pupil data, etc.
Third-party software This term refers to any application built on Pro
SDK.

Pro Glasses 3 User Manual v1.1 9
3 Safety
3.1 General precautions
The Pro Glasses 3 system is described in the Pro Glasses 3 User Manual and must be
used according to the manufacturer’s instructions. Connecting any other component to
the system, or using the components improperly can cause injury to the user or damage
to the equipment and is done so entirely at the user’s own risk.
The Pro Glasses 3 system must be fitted on the test participant according to instructions
in the Pro Glasses 3 User Manual. Tobii Pro or its agents are not liable for damage or
injuries to a person or their property due to a Pro Glasses 3 eye tracker system in any con-
figuration being dropped. Fitting the Pro Glasses 3 onto a test participant is done entirely
at the user’s own risk.
The Pro Glasses 3 system is to be used for research purposes only. Be aware that due to
the low, but possible risk of failure or distraction, the Pro Glasses 3 should not be relied
upon or used in dangerous or otherwise critical situations.
Tobii Pro Glasses 3 head unit is equipped with a head strap to enable tighter mounting of
the eye tracker onto the wearer’s head. Neither Tobii Pro nor its agents are liable for dam-
ages or injuries to a person or their property caused by the Pro Glasses 3 head unit head
strap.
3.2 Usage warning
The Pro Glasses 3 system is composed of several components as described in the
User’s Manual and should be used according to manufacturer instructions. Connecting,
or by other means using any other component than advised in the User’s Manual may
damage or injure a person, their property or recorded data, and is done entirely at the
user’s own risk.
Pro Glasses 3 eye tracker should be fitted on the test participant according to man-
ufacturer instructions. Tobii Pro or its agents are not liable for damage or injuries to a per-
son or their property due to a Pro Glasses 3 eye tracker being dropped in any
configuration. Fitting the Pro Glasses 3 onto a test participant is done entirely at the
user’s own risk.
Pro Glasses 3 head unit is equipped with a head strap to enable tighter mounting of the
eye tracker onto the wearer’s head. Neither Tobii Pro nor its agents are liable for dam-
ages or injuries to a person or their property caused by the Pro Glasses 3 head unit head
strap.

Pro Glasses 3 User Manual v1.1 10
3.3 Emergency
The Pro Glasses 3 system is to be used for research purposes only. Be aware that due to
the low, but possible risk of failure or distraction, the Pro Glasses 3 should not be relied
upon or used in dangerous or otherwise critical situations.
3.4 Child warning
The Pro Glasses 3 is an advanced computer system and electronic device that is com-
posed of numerous separate, assembled parts. These parts have the possibility of
becoming separated from the device, constituting a potential choking hazard or other
danger to a child. Young children should not have access to, or use, the device without
parental or guardian supervision.
3.5 Infrared warning
Do not use the Pro Glasses 3 system when in the vicinity of devices that are susceptible
to Infrared (IR) light. When activated, the Pro Glasses 3 head unit emits IR light, which
can affect certain medical devices and other devices that are susceptible to disturbance
by IR light and/or radiation.
3.6 Photosensitivity/epilepsy warning
Some people with photosensitive epilepsy are susceptible to epileptic seizures or loss of
consciousness when exposed to certain flashing lights or light patterns in everyday life.
This may happen even if the person has no medical history of epilepsy or has never had
any epileptic seizures.
A person with photosensitive epilepsy would also be likely to have problems with TV
screens, some arcade games, and flickering fluorescent bulbs. These people may have a
seizure while watching certain images or patterns on a monitor, or even when exposed to
the light sources of an eye tracker. It is estimated that about 3-5% of people with epilepsy
have this type of photosensitive epilepsy. Many people with photosensitive epilepsy
experience an "aura" or feel odd sensations before the seizure occurs. If the participant
starts to feel odd during use, have them remove the Pro Glasses 3 head unit immediately.
3.7 Mechanical shock
The Pro Glasses 3 system is a delicate measuring instrument used for research pur-
poses and should be treated with care at all times. To avoid breaking or damaging the
internal electronic circuits, do not drop, knock, or shake the device. Eye-tracking quality
or accuracy can be seriously affected if the Pro Glasses 3 head unit or recording unit are
dropped. If the eye tracker is exposed to mechanical shock, for example, when dropped,

Pro Glasses 3 User Manual v1.1 11
do not try to start it or connect it to a power source. Contact Tobii Pro Support for instruc-
tions.
3.8 Bending
To avoid breaking or damaging the internal electronic circuits, do not bend any part of the
eye-tracking system. Eye-tracking quality or accuracy can be seriously affected if the Pro
Glasses 3 head unit or recording unit has been bent.
3.9 Do not open or disassemble
Do not open or disassemble the Pro Glasses 3 head unit or the recording unit. Non-com-
pliance will result in loss of warranty! There are no user serviceable components inside.
Contact Tobii Pro Technical Support if your Pro Glasses 3 system is not working prop-
erly.
3.10 Connectors
The Pro Glasses 3 head unit and recording unit have numerous external interfaces (con-
nectors). Connecting any other device or connector than those intended may cause per-
sonal injuries and/or damage the Pro Glasses. Tobii Pro or its agents are not liable for
any damages or injuries to a person or their property due to connecting unintended con-
nectors.
3.11 Head unit cable
The head unit cable connected to the head unit must only be used to connect to the
recording unit. Do not use the head unit cable for any other purpose or for connecting to
any other devices. Tobii Pro or its agents are not liable for any damages or injuries to a
person or property due to incorrect use of the head unit cable.
3.12 Environment
Avoid any exposure to direct sunlight as this will affect eye tracking quality and longer
exposure can overheat the equipment. Avoid prolonged exposure to any liquids, gels,
moist, rain, or sweat. Do not use the eye tracker underwater.
Do not place or use the equipment in places subject to extreme temperatures and humid-
ity, such as on top of and or near a heating element, in a hot or damp room, or in a hot
automobile in the sun. Usage temperature: 5℃ to +45℃ / 23℉ to 113℉

Pro Glasses 3 User Manual v1.1 12
3.13 Component connection safety
The Tobii Pro Glasses 3 head unit is designed to connect only to the Tobii Pro Glasses 3
recording unit and should not be connected to any other device.
The recording unit is designed to connect only to the head unit and a device running Win-
dows 10 or later operating system, or an Android device with version 9 or later, and with
the Glasses 3 controller application installed. The recording unit should not be connected
to any other devices.
3.14 Battery safety
Caution!
There is a risk of explosion if the battery is replaced by an incorrect type.
Replacement of a battery with an incorrect type can defeat safeguards (for example, in
the case of some lithium battery types).
Disposal of a battery in a fire or a hot oven, or mechanically crushing or cutting of a bat-
tery can result in an explosion.
Batteries exposed to extremely high temperatures or environments can result in an explo-
sion or leakage of flammable liquid or gas.
Batteries subjected to extremely low air pressure may result in an explosion or the leak-
age of flammable liquid or gas.
Attention!
Risque d'explosion en cas de remplacement de la pile par une pile de type incorrect.
Le remplacement d'une PILE par une pile de type incorrect peut neutraliser un
SYSTÈME DE SÉCURITÉ (par exemple dans le cas de certains types de PILES au lith-
ium).
La mise au rebut d'une PILE dans le feu ou dans un four chaud, ou par écrasement ou
découpe, peut entraîner une EXPLOSION.
L'exposition d'une PILE à un environnement présentant une température extrêmement
élevée peut entraîner une EXPLOSION ou une fuite de liquide ou de gaz inflammable.
L'exposition d'une PILE à une pression d'air extrêmement faible peut entraîner une
EXPLOSION ou une fuite de liquide ou de gaz inflammable.

Pro Glasses 3 User Manual v1.1 13
3.15 Wireless warning
The recording unit contains radio transmitters and receivers (WLAN). Make sure that it is
placed as far as possible from any equipment, objects or body parts sensitive to such sig-
nals.
電波法により5GHz帯は屋内使用に限ります。
3.16 Transportation
Use the provided case when traveling with the eye tracker. For shipping and storage, use the ori-
ginal packing.
For transportation, the recommended range for temperature and humidity for the device is as fol-
lows:
lTemperature: -40°C to 65°C (-40°F to 149°F)
lHumidity: 5% to 95%
ETSI 300 019-2-2 V2.4.1, T2.3 (Public transportation) with exception of high air temperature
at +65°C.
3.17 Accessories
Only use accessories provided by or approved by Tobii Pro.
3.18 Cleaning
Avoid touching, scratching, or smudging the lenses on the Pro Glasses 3 head unit or the
Corrective Lenses (optional accessory) and keep all the surfaces clean. Eye tracking
quality may be degraded if surfaces are dusty or damaged. Take special care to ensure
that there are not smudges or scratches covering either the illuminators or sensors in the
lenses as these can impair performance.
Do not use window cleaners, household cleaners, aerosol sprays, solvents, alcohol,
ammonia, or abrasives on any component of the Pro Glasses 3 system.
Before cleaning Pro Glasses 3, unplug the head unit cable.
Use the included cleaning cloth and clean the Pro Glasses 3 lenses gently.
Avoid getting moisture in openings and ports on the device.

Pro Glasses 3 User Manual v1.1 14
3.19 California Proposition 65 warnings
WARNING: The batteries in this product can expose you to chemicals including Car-
bon-Black Extracts and Nickel (Metallic), which is known to the State of California to
cause cancer. For more information, visit P65Warnings.ca.gov.
WARNING: The Tobii Pro Recording Unit in this product can expose you to chemicals
including Carbon-Black Extracts and Nickel (Metallic), which is known to the State of
California to cause cancer. For more information, visit P65Warnings.ca.gov.
WARNING: The USB-C to Gigabit Ethernet Adapter in this product can expose you to
chemicals including Lead and Bisphenol A (BPA), which is known to the State of Cali-
fornia to cause cancer and birth defects or other reproductive harm. For more inform-
ation, visit P65Warnings.ca.gov.
WARNING: The head strap in this product can expose you to Di(2-ethylhexyl)phthalate
(DEHP) and Bisphenol A (BPA), which is known to the State of California to cause can-
cer and birth defects or other reproductive harm. For more information, visit P65Warn-
ings.ca.gov.
WARNING: The foam in the carrying bag in this product can expose you to Benzo
[b]fluoranthene, Benzo[j]fluoranthene, Benzo[k]fluoranthene and Indeno[1,2,3-
cd]pyrene, which is known to the State of California to cause cancer. For more inform-
ation, visit P65Warnings.ca.gov.
WARNING: The AC/DC Adapter including the USB cable in this product can expose
you to chemicals including Bisphenol A (BPA), which is known to the State of California
to cause birth defects or other reproductive harm. For more information, visit P65Warn-
ings.ca.gov.

Pro Glasses 3 User Manual v1.1 15
4 Overview of Tobii Pro Glasses 3
Congratulations on your purchase of Tobii Pro Glasses 3. They're created with active researchers in
mind and give you the freedom to take your research further with wider gaze angles and com-
prehensive data on visual attention.
4.1 Pro Glasses 3 packages
Pro Glasses 3 is sold in four different packages.The table below details the specific features avail-
able in each package.
Components
View
Package
50
Live View
Package
100
Live
View
Wireless
Package
50
Live View
Wireless
Package
100
Pro Glasses 3 controller
application
● ● ● ●
50 Hz ● ●
100 Hz ● ●
WLAN functionality ● ●
Basic support ● ● ● ●
4.2 What’s in the box
Tobii Pro Glasses 3 ships with a convenient carry case containing the following:

Pro Glasses 3 User Manual v1.1 16
1. Recording unit 6. Calibration card
2. Head unit 7. Cleaning cloth
3. Removable nose pads (4 pcs in two different sizes) 8. Head strap
4. Rechargeable Li-ion batteries, type 18650 (3 pcs) 9. Cable clip
5. SD cards with cases (3 pcs)

Pro Glasses 3 User Manual v1.1 17
There is also an accessories box which contains the following items:
1. Battery charger for Li-ion batteries 6. Ethernet cable (3 meters)
2. Ethernet to USB Type-C adapter 7. SD card to USB Type-A
adapter
3. Standard and 12v power cords for the battery charger
(EU, US, UK, AUS)
8. Calibration cards (2 pcs)
4. USB charger for recording unit and USB Type-A to mi-
cro USB adapter cable
9. Calibration stickers (10 pcs)
5. Power adapter plugs for the USB charger (EU, US, UK,
AUS)
Safety and Compliance leaflet
(not pictured)
4.3 Optional accessories
The following optional components can be added to the Pro Glasses 3 system. Learn more on
tobiipro.com.

Pro Glasses 3 User Manual v1.1 18
Component Description
Corrective
Lenses
Snap-on corrective lenses for Tobii Pro Glasses 3 to cater to people
who wear prescription lenses. The Corrective Lenses accessory for
Pro Glasses 3 is a set of attachable lenses to correct both
nearsightedness and farsightedness. This accessory allows you to
include a larger cross-section of the population in your research.
IR Blocking
Safety
Lenses
This accessory package contains two lenses (clear and tinted) that
are compliant with safety glass standards to support research in
bright environments and locations requiring eye protection.
4.4 System components
The Pro Glasses 3 system comprises the head unit, recording unit, and the Pro Glasses 3 controller
application installed on either a computer running Windows 10 or later, or on an Android device run-
ning version 9 or later. Each component is briefly described below. In addition, Tobii Pro Lab soft-
ware can be used for further analysis of eye tracking data.
The system:
1. The head unit, comprised of wearable eye tracking glasses.
2. A recording unit, connected to the head unit via a head unit cable. The recording unit holds the
battery and stores the recorded data on a SD card. The recording unit is controlled from a
device running Pro Glasses 3 controller application.
3. Pro Glasses 3 controller application is used to manage the participants, start and stop record-
ings, and to view real time and recorded video and eye-tracking data.
Pro Glasses 3 controller application is designed to be installed and used on a com-
puter running Windows 10 or later or an Android device running version 9 or later.
The application should not be installed on any other type of devices.
4. Either a computer running Windows 10 or later, or an Android device running version 9 or
later with Pro Glasses 3 controller application installed. Pro Glasses 3 controller application
connects to the eye tracker through an network connection (either wireless or wired).
5. Tobii Pro Lab (purchased separately) installed on a Windows computer. Any eye-tracking ana-
lysis beyond qualitative analysis of eye-tracking session replay, is carried out using Tobii Pro
Lab.
The Pro Glasses 3 controller application is designed to be used only with Pro
Glasses 3. No other types of eye trackers can or should be used together with the
Pro Glasses 3 controller application.
4.5 Head unit
The head unit is a highly sophisticated measuring device. It consists of several very sensitive sensors
and must be cared for correctly. For more information, read Product Care.

Pro Glasses 3 User Manual v1.1 19
The head unit consists of the following parts:
Part Description
1. Infrared illuminators (x 8
per eye)
Illuminates the eyes to assist the eye-tracking sensors
2. Head unit cable Connects to the recording unit to save collected data
3. High-definition scene cam-
era
Captures a Full HD video of what is in front of the participant
4. Microphone Picks up sounds from the participant and their immediate sur-
roundings
5. Eye-tracking cameras (x 2
per eye)
Records eye orientation and movements
6. Accessory mounting
holes
Used to attach some of the optional accessories, for example the IR
Blocking Safety Lens
7. Nose pad Additional nose pads can be used to change sizing

Pro Glasses 3 User Manual v1.1 20
4.6 Recording unit
The recording unit is a small computer that controls the head unit. It records and stores eye-tracking
data, sounds, and scene camera video on a removable SD card. The recording unit carries a replace-
able and rechargeable Li-ion battery that supplies power to both the recording unit and the head unit.
The recording unit has several connectors and a power button and is controlled from Pro Glasses 3
controller application.
The recording unit consists of the following parts:
Part Description
1. Head unit con-
nector
Connects to the head unit cable
2. Micro USB con-
nector
Connects to USB charger for powering the unit and charging the battery
3. 3.5 mm con-
nector for data syn-
chronization
TTL pulse for synchronization with external data sources
4. Power button
and LED power
indicator
Touch button that turns the recording unit on and off. LED power indicator
indicates power state and remaining battery power
5. SD card Activity
LED
Indicates if SD card is present and if the recording unit is currently saving
data to the SD card
6. Connection
status LED
Indicates connection to the head unit.
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