The Elk 6022 has a built in reed switch plus two additional relay inputs which can monitor NO or NC devices.
Compatible with ELK-M1XRFTW two-way wireless transceiver
Zones: Built-in reed, IN1, and IN3 (closed circuit terminals)
Front and back tamper option
1 X Elk 6022 Universal 3-Zone Sensor
902 Mhz - 928 Mhz frequency hopping
Maximum operating gap of reed: 1/2�
3V CR123A lithium battery
Battery Life: 7 years typical
Size: 1.5�W x 3�L x .9�D, Magnet: .57�W x 1.5�L x .6�D
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