Keychron K4 Bluetooth Mechanical Keyboard Quick Start Guide

IN THE BOX

• Keychron K4 Bluetooth Mechanical Keyboard x 1
• Type-C Cable * 1
• Manual * 1
• Quick Start Guide * 1
• Extra Keycaps Set * 1

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

1. Connect Bluetooth
   
   
   
   
   
   

2. Connect Cable
   
   
   
   
3. Change Light Effect
   
   
   
   
4. Switch Between Function and Multimedia Keys (F1-F12)
   
   
   
   
   
5. Disable Auto Sleep Mode
   
   
   
6. Remap keys
   
   
7. Linux's Setting
   
   
8. Turn Off the Backlight
   
   
   
   
9. Factory Reset
   

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 specifications can be subjected to change without notice we apologize for any inconvenience caused

K4 BLUETOOTH MECHANICAL KEYBOARD OVERVIEW

1. Charging port
2. Win/Android Mac/iOS (OS Toggle Switch)
3. BT OFF Cable (Mode Toggle Switch)

LED STATUS OVERVIEW

FUNCTION DESCRIPTION: CHARGING

Plug the cable into a USB port and plug the other end into the keyboard port. Charging Indicator: When battery is below 15%, a red battery blinking indicater will be triggered. A red light will stay on while charging; Fully charged in around 3 hours, a green battery indicator will appear.

*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.

BLUETOOTH/WIRED MODE (TOGGLE SWITCH)

WIRED MODE

1. Switch the toggle switch to Cable option (it only works when a USB cable is plugged in).
2. Connect our cable with your PC and keyboard.
3. Backlit will be turned on.
   *Under Wired Mode, keyboard will not enter into Battery Saver Mode.

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 flashes for 3 minutes to detect pairing.
4. Search for the Bluetooth device "Keychron K4" on your device and connect it (the Bluetooth indicator goes off 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 flash for 3 minutes.
   **Slow or failed connections may exist due to different Bluetooth versions, please make sure all the settings are correct.

SWITCH BLUETOOTH DEVICES
Short press combination key "fn" + "1" / "fn" + "2" / "fn" + "3" to switch to other device.

RECONNECT:

1. Switch the keyboard to the Bluetooth option to activate the keyboard (the keyboard will connect to the last connected device by default).
2. The Bluetooth indicator flashes for 4 seconds and automatically pairs with the last paired device.
3. If the Bluetooth indicator is off, press any button to enter the connection again.
   * The keyboard must have been paired with the device to perform this function.

TURN OFF THE KEYBOARD
Switch to "Off"

BATTERY SAVER

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.

BACKLIT SETTING

• Short press to switch between different types of lighting effects.
• When backlit is on, press button to switch among them. Short press fn and "left arrow" or fn and "right arrow' to adjust light colors. (For RGB version only)

OS SWITCH

1. MAC/iOS
   Turn the switch to Mac/iOS when you are connected to a Mac or iOS operating system.
2. WINDOWS/ANDROID
   Switch the toggle to Windows/Android when the keyboard is connected to a Windows or Android operating system.
   *When using the Windows/Android mode, keys are used for "Windows" and "Alt" functions.
3. INPUT METHOD SWITCH
   For iOS:
   Input method switch: Ctrl + Space
   Caps Lock: Caps (Enable General» Keyboards> Hardware Keyboard>Caps Lock Language Switch)
   For Android:
   Input method switch: Shift + Space
   NOTE:
   Functions of certain multimedia key may be disabled due to compatibility, versions, brands and drivers of Windows/Android OS. We also recommend not to switch OS frequently as it may impact keyboard operations.

TROUBLESHOOTING

If unable to pair keyboard to device, confirm that the device you're trying to pair with is Bluetooth-capable. If so, restart the device and try pairing it with the keyboard again.

Note:
On a Windows computer, a new Bluetooth connection will sometimes require additional
software updates—a process that may still be ongoing after a message appears indicating a successful
completion, Wait at least 20 minutes after pairing to make sure all updates are completed before
restarting the computer.

Confirm that the device is configured to accept Bluetooth connections (Windows) and supports an
external keyboard (HID profile).

Go to Bluetooth Devices > Open Settings and select the following:
Allow Bluetooth devices to find this computer
Allow Bluetooth devices to connect to this computer
Alert me when a Bluetooth device wants to connect

My keyboard isn't working.

For the keyboard: Turn the keyboard off and back on.
Turn Bluetooth off and restart the computer. (Windows)
For the device:
Go to Bluetooth settings and turn off Bluetooth and "forget" the keyboard.
Restart the device and turn on Bluetooth to reconnect.

Bluetooth connection is interrupted even within 10 meter.

Check if the keyboard is resting on a metal surface that can interfere with the Bluetooth signal.

Third party input tools are not compatible with the keyboard.

Due to compatibility, versions, brands and drivers of Windows/Android OS, functions of third party input tools may be affected while using the keyboard. Please make sure your operating
system and drivers are up to date.

Certain fn keys or multimedia keys does not work under Windows/Android mode.

Functions of certain multimedia keys may be disabled due to compatibility, versions, brands
and drivers of Windows/Android OS.

Safety Precaution:
Keep the product, accessories and packaging parts out of reach of children to prevent any accidents and choking hazards.
Always keep the product dry to avoid corrosion.
Do not expose the product to extreme temperatures below -10°C (5°F) or above 50°C (131°F) to
preserve the lifespan of the keyboard and battery.

Keychron, Inc.
Dover, DE 19901, United States
Find us at:
https://www.keychron.com
Support@keychron.com
@keychron
@keychron
@keychronMK
Designed by Keychron
Made in China