Power: Receiver: 4 AA batteries (not included); Transmitter: 12V 23A battery (not included) Range: 150 meters (492 feet) The receivers are economical and can be used independently. If one fails, the others continue to operate. This system is expandable—additional receivers may be purchased separately. The receivers come pre-programmed for convenience and are reprogrammable. To reprogram, locate the 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. The receiver is now paired with the remote. Caution! 1. Handle the product with care; avoid shaking and dropping it. 2. Keep the receiver away from sources of potential damage. 3. Remove batteries before storage. 4. Store the product in a clean, dry area, away from contaminants. Frequency: 433 MHz 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 Note: Light reflection and display differences may cause slight color variation between the image and the actual item. Measurement tolerance is ±1–3 cm.