Three LED light status cables let you know what's going on with KAB boards since the board is concealed inside your project.
Dayton Audio KAB-LED Red/Green/Blue LED Package for Bluetooth Amplifier Boards
The KAB-LED light cable kit includes three different status LEDs that are clear when not in use, but when lit they are blue, red, and green. Plug the blue LED into the Bluetooth LED socket, the red LED into the LED power socket, and the green into the charging LED status socket.
Easy in use and work exactly as they are supposed to!