Power: Receiver: 4 AA batteries; Transmitter: 12v 23A battery<br> Range: 150 meters (492 feet)<br> 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.<br> Caution!<br> 1. Handle your product with care avoid shaking and dropping it.<br> 2. Keep the receiver as far from your as possible to avoid damage.<br> 3. Remove batteries before storage.<br> 4. Store your product in a clean dry area from containments.<br> Frequency: 433MHz<br> 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.<br> color:As shown<br> Material:plastic<br> Package Contents:<br> 1 x receivers<br> 1 x transmitter<br> Only the above package content, other products are not included.<br> 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.