The MCT-340 is a fully supervised, wireless magnetic contact sensor, for use with ZigBee enabled home security panels. The sensor includes a built-in reed switch (that opens upon removal of a magnet placed near it). The MCT-340 tamper switch is activated when the cover is removed. A periodic supervision message is transmitted automatically. The target receiver is thus informed, at regular intervals, of the unit’s active participation in the system. Operating power is obtained from an on-board 3 V Lithium battery. When the battery voltage is low, a low battery message will be sent to the receiver 30 days before expiration of battery life Specifications: WIRELESS Supported Network: ZigBee Home Automation 1.2 Frequency: 2.4 GHz as per IEEE 802.15.4 Tamper Alert: Reported when a tamper event occurs and in any subsequent message, until the tamper switch is restored. ELECTRICAL Internal Battery: 3V Lithium battery, type CR2032. Use Varta only. Nominal Battery Capacity: 230 mAh Battery Life Expectancy: 3 years (for typical use).