Keychron K2 - Bluetooth Device Management; Switching Connected Devices; Reconnecting to Devices; Powering Off the Keyboard

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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”
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RECONNECT:
TURN OFF THE KEYBOARD