What Do the Lights on the Bluetooth Folding Keyboard Mean?

Last Update: October 2nd, 2026
Article ID: 615374

What Do the LED Lights on Plugable Folding Keyboards Mean?

The LED lights on Plugable folding keyboards indicate the keyboard's charging, battery, Bluetooth pairing, connection, and operating status. The exact LED behavior varies depending on whether you are using the BT-KEY3XL or BT-KEY3.

What Do the LED Lights on the BT-KEY3XL Mean?

Light Status
Power LED in Red The keyboard is charging through the USB port. It will go out when charging is finished.
Power LED in Green The keyboard has sufficient charge for operation. (Turns on when opening the keyboard, then turns off.) 
Power LED in Green - flashing You can check the keyboard's charge level by pressing Fn + Right Alt.  This LED indicates the battery level from 4 flashes (full battery) to 1 flash (needs charging).
State LED in Blue - flashing The keyboard is broadcasting its existence through Bluetooth and can be discovered by your computer,  tablet, or phone.  (Press Fn + C to enter Bluetooth parting mode) 
State LED in Green The keyboard is operating in USB mode *)   
Caps LED in Blue Caps Lock is on. 

How Do I Switch Between Bluetooth and USB Mode on the BT-KEY3XL?

The BT-KEY3XL can operate using either Bluetooth or a USB connection. Use the following keyboard shortcuts to switch between modes:

  • Fn + 1: Bluetooth mode
  • Fn + 2: USB mode

What Do the LED Lights on the BT-KEY3 Mean?

Light Status
Left LED in Blue - flashing The keyboard is broadcasting its existence through Bluetooth and can be discovered by your computer,  tablet, or phone.  (Press Fn + C to enter Bluetooth parting mode.) 
Left LED in Red -  flashing The battery needs charging. 
Right LED in Green The keyboard is ready to use. (Turns on when opening the keyboard, then turns off.) 
Right LED in Red  The keyboard is charging through the USB port. It will go out when charging is finished.

Applicable To

  • Plugable BT-KEY3XL Folding Bluetooth Keyboard
  • Plugable BT-KEY3 Folding Bluetooth Keyboard