SERCOMM SZ-DWS04 Wireless Security Door Window Sensor Xfinity/TW ZigBee New in Box Door/window sensor consists of a magnet that attaches to a door or window and a 2.4Ghz IEEE 802.15.4 standard wireless sensor Each door/window sensor continually tests its battery and notifies the control panel when they need to be changed The door/window sensor will communicate intrusions to the home security system When the magnet is moved away from the sensor, a signal is sent to the control panel that sets off an alarm if the security system is armed Signals can also be used to activate a chime or convenience lighting based on system user settings