Set consists of an IR remote control and a 4-channel receiver. By pressing one of four buttons on the remote control will activate its status LEDs and the corresponding output will go from low level to high level (+5 Volt). The range of the remote control is about 5-8 meters. Receiver power supply: 3 V to 5 V, the remote supply: 3V CR2025 battery (included), receiver size (mm): 38 x 29 x 12, the remote control dimensions (mm): 85,5x40x6,5.