A brief green LED for Power after the keyboard is opened means the keyboard has sufficient charge for operation and is ready to use.

A red LED for Power indicates the keyboard is charging.

A blue LED for State means the keyboard is broadcasting its existence through Bluetooth, and can be discovered by your tablet or phone.

A green LED for State means the keyboard is operating in USB mode (BT-KEY3XL only).

You can switch back to Bluetooth mode by pressing Fn + 1.

A red LED for Caps indicates Caps Lock is on.