The 2GIG Recessed Door Contact is the industry’s most flexible supervised door contact. It communicates with the 2GIG Control Panel using the 345 MHz wireless frequency and is fully encrypted. It also allows a multitude of applications while hiding the transmitter within a door or window frame. It is powered by a replaceable lithium battery, which should last five (5) years under normal usage.
2GIG Recessed Door and Window Sensor DW20e at Omaha Security Solutions