Door and window contacts work with a sensor and a magnet. The sensor is placed on the frame of the door or window, while the magnet is placed on the door or window itself. This creates a circuit between the two. However, when the circuit is broken by opening up the window or door, a signal is sent to the alarm control panel that an entry has been breached.
Power Requirements:DC=12V-8.4V(23A DC=12V battery inside)
Current Consumption: less than 20uA; less than 15mA while transmitting
Transmit Duration:less than 1s
Transmit Distance from host:more than 80m(no obstacle)
Installation:less than 15mm between part A and part B