<p>Power: Receiver: 4 AA batteries; Transmitter: 12v 23A battery </p> <p> </p> <p>Range: 150 meters (492 feet) </p> <p> </p> <p>The receivers are very economical. They can be used independently. If one fails, the others will continue to operate. This system is expandable. Simply purchase more receivers from the website . The receivers come pre-programed for your convenience however they are reprogrammable. Locate a small hole in the center of the receiver and insert a paperclip or similar object. The receiver will flash then press a corresponding key on the remote. Now the receiver has been paired with the remote. </p> <p> </p> <p>Caution! </p> <p> </p> <p>1. Handle your product with care avoid shaking and dropping it. </p> <p> </p> <p>2. Keep the receiver as far from your as possible to avoid damage. </p> <p> </p> <p>3. Remove batteries before storage. </p> <p> </p> <p>4. Store your product in a clean dry area from containments. </p> <p> </p> <p>Frequency: 433MHz </p> <p> </p> <p>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. </p> <p> </p> <p>color:As shown </p> <p> </p> <p>Material:plastic </p> <p> </p> <p>Package Contents: </p> <p> </p> <p>1 x receivers </p> <p> </p> <p>1 x transmitter </p> <p> </p> <p>Only the above package content, other products are not included. </p> <p> </p> <p>Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +\/- 1-3cm.</p>