Keychron K4 User manual

K4 Bluetooth Mechanical Keyboard

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Keychron K4 Bluetooth Mechanical Keyboard x 1
Type-C Cable * 1
Manual * 1
Quick Start Guide * 1
Extra Keycaps Set * 1
IN THE BOX:

Quick Start Guide
If you are a Windows user, please find the appropriate keycaps in the box,
then follow the instructions below to find and replace the following keycaps.
Mac / Windows
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Press fn + 1 (for 4 seconds) and pair with
device named Keychron K4
Switch toggle to Bluetooth
Switch toggle to Cable

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For RGB version - Press fn + right arrow /
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For Windows: Press fn + X + L (for 4 seconds) to switch
Keyboard

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6 6.5
For Mac - Karabiner For Windows - SharpKeys
Karabiner SharpKeys
Remap keys Linux’s Setting
We have a Linux user group on facebook. Please search
“Keychron Linux Group” on facebook. So you can
better experience with our keyboard.
We don’t have an oicial software to remap the keys yet.
But you can use these two software to get the job done.
(Except the light eect key)
Disable Auto Sleep Mode
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Press fn + S + O (for 4 seconds) to disable the Auto Sleep Mode.
The keyboard goes to Auto Sleep Mode in 10 minutes

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If you are on the Mac, the default is to press F5 key.
If you are on the Windows, the default is to press fn + F5 key.
Factory Reset
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JZ
Try factory reset by pressing fn +J +Z（for 4 seconds)

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K4 BLUETOOTH MECHANICAL KEYBOARD SPECIFICATIONS
Number of keys: 100
Switch type: Mechanical / Optical Switch
Battery: 4000mAh
Working time: Around 70 hours with the backlight on.
Charging time: Around 3 hours
Charging port: USB Type-C
Mode: Bluetooth/Wired
Bluetooth operating distance: Within 10 meters (open space)
Name of Bluetooth device: Keychron K4
Operating Environment: -10 to 50° c
Technical specications can be subjected to change without notice we apologize for any
inconvenience caused

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K4 BLUETOOTH MECHANICAL KEYBOARD OVERVIEW
Mac
Windows
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2
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Charging port
Win/Android Mac/iOS (OS Toggle Swit
ch)
BT OFF Cable (Mode Toggle Switch)

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LED Location
Battery indicator
Bluetooth indicator
Function
Charging
Bluetooth
Status
Low battery - Blinking Red
Charging - Static Red
Fully charged - Static Green
Pairing - Fast Blinking
Paired - Light Off
Switching - Slow Blinking
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LED STATUS OVERVIEW
*The Keychron keyboard is compatible with all USB ports. Please use a 5V 2A adapter or USB 3.0 for
the best performance. The Keychron K4 can be charged in Bluetooth/on/off mode.
** This product supports up to 5V charging voltage and 2A charging current. We are not responsible
for any problems caused by improper charging.

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Backlit will be turned on.
BLUETOOTH MODE
1. Switch the keyboard to Bluetooth option.
2. Backlit will be turned on.
3. Hold "Fn+1" key for 4 seconds to activate Bluetooth pairing (the Bluetooth indicator fast ashes
for 3 minutes to detect pairing.
4. Search for the Bluetooth device "Keychron K4" on your device and connect it (the Bluetooth
indicator goes o after successful pairing).
Note: This keyboard supports pairing up to 3 devices simultaneously via combination key
“fn” + “1” / “fn” + “2” / “fn” + “3”.
*The Bluetooth indicator will continue to ash for 3 minutes.
**Slow or failed connections may exist due to dierent Bluetooth versions, please make sure all the
settings are correct.

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TURN OFF THE KEYBOARD
Under Bluetooth mode, the keyboard backlight turns off when it is inactive for 10 minutes. Tap any
button to wake the keyboard. If want to disable this auto battery save mode, press fn+S+O for 4
seconds. Then if want to enter this power save mode again, press fn+S+O for 4 seconds.
“fn” + “1” / “fn” + “2” / “fn” + “3”
RECONNECT:

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BACKLIT SETTING

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confirm
connections
connection
Settings
find

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