Black Infrared Remote Control Extender IR Repeater System Kit With 4 Emitter 1 Receiver Color: Black With 1 receiver which picks up the signal from the remote controller, the receiver is with a convenient IR confirmation LED. With 4 emitters which is used to send the signals to the A/V components. 5V USB AC Power Supply. 34-60kHz operating range. 1. Stick the Receiver in a convenient location that you want with the included double sided tape. 2. Stick the IR emitters (the smaller one) on devices that you want to control.