Keychron K15 Max Wireless Mechanical Keyboard User 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 Keycap Replacement
Diagram showing the layout of the keyboard with highlighted keys for Windows keycap replacement.

Connecting the Keyboard

Connect 2.4GHz Receiver
Connect the 2.4GHz receiver to the device USB port. Switch toggle to 2.4GHz mode.
Note: For the best wireless experience, we recommend using the extension adapter for receiver and putting the 2.4GHz receiver somewhere on your desk close to your keyboard for a low rate of latency and fewer signal interferences.

Connect Bluetooth
Switch toggle to Bluetooth. Press fn + 1 (for 4 seconds) and pair with device named Keychron K15 Max.

Connect Cable
Switch toggle to Cable mode and connect using the provided Type-C cable.

Switch to the Right System
Please make sure the system toggle on the top left corner has been switched to the same system as your computer’s operating system.

Backlight Settings

The Backlight
Press fn + Q to change the lighting effect. Press fn + tab to turn the backlight on/off.

Adjust the Backlight Brightness
Press fn + W to increase the backlight brightness. Press fn + S to decrease the backlight brightness.

Adjust the Backlight Speed
Press fn + T to increase the light effect speed. Press fn + G to decrease the light effect speed.

The Layers
There are four layers of key settings on the keyboard. The layer 0 and layer 1 are for the Mac system. The layer 2 and layer 3 are for the Windows system.
If your system toggle is switched to Mac, then the layer 0 will be activated. If your system toggle is switched to Windows, then the layer 2 will be activated. Remember that if you are using it in Windows mode, please make changes to the layer 2 instead of the top layer (the layer 0). This is a common mistake people are making.

The Keychron Launcher App
Please visit launcher.keychron.com to use the online Launcher web app to remap the keys, create macro commands, or flash the firmware. If the Launcher cannot recognize your keyboard, please reach our support to get the instructions.
The online Launcher can only run on the latest version of Chrome, Edge, and Opera browsers. The Launcher only works when the keyboard is connected by wire to the computer.

Factory Reset & Firmware Update

Troubleshooting? Don’t know what’s going on with the keyboard?

Factory reset your keyboard

Power on your keyboard.
Press and hold fn + J + Z (for 4 seconds). The keyboard backlight will flash in red quickly for 3 seconds, indicating that the keyboard has been reset.

Flash your keyboard firmware

Visit launcher.keychron.com to open the online Launcher web app.
Ensure the keyboard is in Cable or Wired mode and plug in the power cable.
Find the ‘Firmware Update’ tab on the left side of the Launcher and connect your keyboard with it.
Follow the instructions on the Launcher and complete the firmware update.

*Step-by-step guide, search the keyword “firmware” on keychron.com.

Warranty
The keyboard is highly customizable and easy to be rebuilt. If anything goes wrong with any of the keyboard components during the warranty period, we will only replace the defective parts of the keyboard, not the whole keyboard.

Specifications

Number of keys	90
Switch type	Mechanical
Battery	2000mAh
Charging time	Around 3 hours
Charging port	Type-C
Mode	Bluetooth / Wired / 2.4GHz
Bluetooth operating distance	Within 10 meters (open space)
Name of Bluetooth device	Keychron K15 Max

LED Status Overview

LED Location	Function	Status
Power Indicator	Charging	Charging – Static Red Fully charged – Static Green
Bluetooth / 2.4 GHz Indicator	Bluetooth / 2.4 GHz	Reconnecting – Fast Blinking Paired – Light off Pairing – Slow Blinking
Caps Lock Indicator	Caps Lock	Enable Caps Lock – Static Red Disable Caps Lock – Light Off

FAQ

How do I switch between Mac and Windows modes
Use the system toggle on the top left corner of the keyboard to switch between Mac and Windows modes.
How do I reset the keyboard to factory settings?
Press and hold fn + J + Z for 4 seconds. The backlight will flash red to indicate a reset.
Can I update the firmware of the keyboard?
Yes, visit launcher.keychron.com and follow the instructions for firmware updates.
What should I do if the keyboard is not recognized by the Launcher app?
Ensure the keyboard is connected by wire and try using the latest version of Chrome, Edge, or Opera browsers.

IN THE BOX

Keychron K15 Max Wireless Mechanical Keyboard x 1
Type-A to Type-C Cable x 1
Switch Puller (Hot-Swappable Version only) x 1

Keycap Puller x 1
Manual x 1
Quick Start Guide x 1

Extra Keycaps Set x 1
Extension Adapter for Receiver x 1
Type-A 2.4GHz Receiver x 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.

Connect 2.4GHz Receiver

Note: For the best wireless experience, we recommend using the extension adapter for receiver and putting the 2.4GHz receiver somewhere on your desk close to your keyboard for a low rate of latency and fewer signal interferences.

Connect Bluetooth

Connect Cable

Switch To The Right System

Please make sure the system toggle on the top left corner has been switched to the same system as your computer’s operating system.

The Backlight

Adjust The Backlight Brightness

Adjust The Backlight Speed

The Layers

There are four layers of key settings on the keyboard. The layer O and layer 1 are for the Mac system. The layer 2 and layer 3 are for the Windows system.

If your system toggle is switched to Mac, then the layer O will be activated.
If your system toggle is switched to Windows, then the layer 2 will be activated. Remember that if you are using it in Windows mode, please make changes to the layer 2 instead of the top layer (the layer 0). This is a common mistake people are making.

The Keychron Launcher App
Please visit launcher.keychron.com to use the online Launcher web app to remap the keys, create macro commands, or flash the firmware. If the Launcher cannot recognize your keyboard, please reach our support to get the instructions.

‘The online Launcher can only run on the latest version of Chrome, Edge, and Opera browsers.
*The Launcher only works when the keyboard is connected by wire to the computer.

Factory Reset & Firmware Update

Troubleshooting? Don’t know what’s going on with the keyboard?

Factory reset your keyboard

Power on your keyboard.
Press and hold fn + J + Z (for 4 seconds). The keyboard backlight will flash in red quickly for 3 seconds, indicating that the keyboard has been reset.

Flash your keyboard firmware

Visit launcher.keychron.com to open the online Launcher web app.
Ensure the keyboard is in Cable or Wired mode and plug in the power cable.
Find the ‘Firmware Update’ tab on the left side of the Launcher and connect your keyboard with it.

Follow the instructions on the Launcher and complete the firmware update. ‘Step-by-step guide, search the keyword “firmware” on keychron.com

Warranty

The keyboard is highly customizable and easy to be rebuilt.
If anything goes wrong with any of the keyboard components of keyboard during the warranty period, we will only replace the defective parts of the keyboard, not the whole keyboard.

K15 MAX WIRELESS MECHANICAL KEYBOARD SPECIFICATIONS

Number of keys: 90
Switch type: Mechanical

Battery: 2000mAh
Charging time: Around 3 hours
Charging port: Type-C

Mode: Bluetooth / Wired / 2.4GHz
Bluetooth operating distance: Within 10 meters (open space)
Name of Bluetooth device: Keychron K15 Max

LED STATUS OVERVIEW

LED Location	Function	Status
Power Indicator	Charging	Charging – Static Red Fully charged – Static Green
Bluetooth / 2.4 GHz Indicator	Bluetooth / 2.4 GHz	Reconnecting – Fast Blinking Paired – Light off Pairing – Slow Blinking
Caps Lock Indicator	Caps Lock	Enable Caps Lock – Static Red Disable Caps Lock – Light Off

K15 MAX WIRELESS MECHANICAL KEYBOARD OVERVIEW

Bluetooth Indicator
2.4GHz Indicator
T ype-C Port

2.4G / Cable / BT
(Connection Mode Toggle) @Win/Android Mac/iOS (OS Toggle)
Power Indicator

Caps Lock Indicator

DEFAULT KEY LAYOUT

LAYER 0: This layer will be activated when your keyboard’s system toggle is switched to Mac.
Layer 1: This layer will be activated when your keyboard’s system toggle is switched to Mac and press the fn/M0(1) key.

LAYER 2: This layer will be activated when your keyboard’s system toggle is switched to Windows.
- LWin = Left Windows LAlt = Left Alt RAlt = Right Alt RCtl = Right Ctrl
LAYER 3: This layer will be activated when your keyboard’s system toggle is switched to Windows and press the fn/M0(3) key.

KEY DESCRIPTION

Key Description
Ser-	Screen Brightness Decrease
Ser+	Screen Brightness Increase
Bright-	Backlight Decrease
Bright+	Backllght Increase
Prvs	Previous
Play	Play/Pause
Next	Next
Mute	Mute
Vol-	Volume Decrease
Vol+	Volume Increase
RGB Toggle	Turn Backlight on/off
RGBMd+	RGB Mode Next

Key Description
RGBMd-	RGB Mode Previous
Hue+	Hue Increase
Hue-	Hue Decrease
RGB SPI	RGB Speed Increase
RGB SPD	RGB Speed Decrease
MO(l)	Layer 1 will be activated when holding this key
M0(3)	Layer 3 will be activated when holding this key
BTH1	Bluetooth Host 1
BTH2	Bluetooth Host 2
BTH3	Bluetooth Host 3
2.4G	2.4GHz Host
Batt	Battery life

Key Description
NKRO N-Key rollover

FUNCTION DESCRIPTION

CHARGING

Plug the cable into a USB port and plug the other end into the keyboard port. Power Indicator:

A red light will stay on while charging; Fully charged in around 3 hours, a green battery indicator will appear.
The K15 Max keyboard is compatible with all USB ports. Please use a 5V IA adapter or USB 3.0 for the best performance. The K15 Max can be charged in 2.4GHz/Cable/Bluetooth mode.
This product supports up to 5V charging voltage and IA charging current. We are not responsible for any problems caused by improper charging.

2.4GHZ / CABLE / BLUETOOTH MODE (MODE TOGGLE)

2.4GHZ MODE

Connect the 2.4GHz receiver to your device’s USB Port.

Switch the toggle to the 2.4GHz option. The keyboard will automatically connect to your device.

BLUETOOTH MODE

Switch the toggle to the Bluetooth option.

Backlighting will be turned on.
Hold “fn+l” key for 4 seconds to activate Bluetooth pairing (the Bluetooth indicator fast flashes for 3 minutes to detect pairing).
Search for the Bluetooth device “Keychron K15 Max” 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 key combination “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 key combination “fn” + “1” / “fn” + “2” / “fn” + “3” to switch to other device.

RECONNECT

Switch the keyboard to the Bluetooth option to activate the keyboard.
The Bluetooth indicator flashes for 3 seconds and automatically pairs with the last paired device.
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.

WIRED MODE

Switch the toggle to the Cable option .
Connect our cable with your PC and keyboard.

Backlighting will be turned on.
*Under Wired Mode, keyboard will not enter into Battery Saver Mode.

TURN OFF THE KEYBOARD
Switch the keyboard to the Cable option and unplug the power cable.

BACKLIGHT SETTING

Short press key combination “fn’j + “tab” or ‘Ifni’ + “knob(press)” turn the backlight on/off.
Short press key combination “fn” + “Q’ or “fn” + “A” to switch between different types of lighting effects.

OS TOGGLE SWITCH

MAC/iOS
Switch the toggle to Mac/iOS when the keyboard is connected to a Mac or iOS operating system.
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.
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 in Bluetooth mode.

For the computer/smartphone

Go to your device Bluetooth settings>SeIect the keyboard and remove/delete/unpair it.
Then restart your device.

For the keyboard

Turn the keyboard off and back on. Then reconnect it to your device.
My keyboard isn’t working in 2.4 GHz mode.

Ensure the toggle is set to 2.4 GHz, remove the receiver from your device, and press “fn” + “4” for 4 seconds to force pair, then reinsert the receiver into the device, keeping the keyboard within 20 cm of the receiver for optimal pairing.

Bluetooth connection is interrupted even within 10 meters.

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 function keys or multimedia keys do not work.

Functions of certain multimedia keys may be disabled due to compatibility, versions, brands, and drivers of devices.
*Function keys: Fl /F2/F3/F4/F5/F6/F7 /F8/F9/ Fli / F12
Multimedia keys:

Safety Precaution:
Keep the product, accessories and packaging parts out of the 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 -100C(140F) or above 500C(1220F) to preserve the lifespan of the keyboard.

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

Made in China

Documents / Resources

Keychron K15 Max Wireless Mechanical Keyboard [pdf] User Guide
K15 Max, K15 Max Wireless Mechanical Keyboard, Wireless Mechanical Keyboard, Mechanical Keyboard, Keyboard

References

User Manual

Keychron K15 Max Wireless Mechanical Keyboard