This door window sensor can be used in the Tech， defender， sentry and GSM home alarm telephone systems.<br />Microcomputer intelligent control， steady performance;<br />Detect from door or window<br />With built-in antenna<br />It will send alarm signals to the control host once the door or window is opened<br />Low battery indication<br />Transmission frequency: 433MHz<br />Operating power: 23A 12V<br /><br />1 x Wireless Door Sensor Detector Kit<br /><img src="http://img6.eachbuyer.com/x9/p100/cq260_1.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/cq260_2.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/cq260_3.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/cq260_4.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/cq260_5.jpg" />