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 expandablesimply purchase additional receivers. The receivers come pre-programmed for convenience and are reprogrammable. To pair, locate the small hole in the center of the receiver and insert a paperclip or similar object. When the receiver flashes, press the corresponding button on the remote to complete pairing. Caution! 1. Handle the product with care; avoid shaking and dropping. 2. Keep the receiver away from strong electromagnetic sources to prevent interference. 3. Remove batteries before storage. 4. 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 Only the items listed above are included; other products are not included. Note: Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement may vary by +/- 1-3 cm.