Power: Receiver uses 4 AA batteries; Transmitter uses one 12V 23A battery. Range: 150 meters (492 feet). The receivers are economical and can operate independently. If one receiver fails, the others continue to function. The system is expandable by adding more receivers. Receivers come pre-programmed for convenience but are reprogrammable. To reprogram, locate a small hole in the center of the receiver and insert a paperclip or similar object. The receiver will flash, then press the corresponding key on the remote to pair. Caution: Handle the product with care and avoid shaking or dropping it. Keep the receiver as far away from the firing area as possible to avoid damage. Remove batteries before storage. Store the product in a clean, dry area away from contaminants. Frequency: 433MHz. This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. Color: As shown. Material: Plastic. Package Contents: 1 x Receiver, 1 x Transmitter. Condition: New.