This article explains what the LED keys on Plugable Folding keyboards indicate when they light up.
BT-KEY3XL:
| 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 | The keyboard is ready to use. (Turns on when opening the keyboard, then turns off in a few seconds.) |
| 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. |
*) Switching USB / Bluetooth mode:
- Fn + 1 : Bluetooth mode
- Fn + 2 : USB mode
BT-KEY3:
| 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. |