The transmitter enclosure has a threaded nipple, O-ring and locking nut for mounting directly to the conduit entrance of any dry contact device not listed as explosion proof. The transmitter provides two flying leads for connection to the normally open contacts of any listed dry contact fire alarm device. The connection is supervised for opens and shorts using the supplied 5.1k ohm End Of Line Resistor. The transmitter does not latch, it follows the status of the sprinkler switch it is connected to. The unit is powered by two (2) AA size 1.5 volt Lithium Iron/Disulfide batteries. The device includes a cover tamper switch as well as an LED to indicate when the battery meter has been reset.