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The WSG Dry Contact Sensor is a wireless alarm unit designed for use with the Sensaphone WSG 30. The sensor comes with a wireless transmitter for communicating with the WSG-30 as well as input terminals Normally Open or Normally Closed alarm contacts. The unit also comes complete with two AA batteries which will power the sensor for up to two years*.
*AC Adapter Available in which case the batteries become a backup power source!
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