The repeater can be powered by one 3.6 volt D size Lithium Thionyl battery or by the auxiliary power of the fire panel or UL 864 or UL 1481 listed 24 VDC supply with battery backup. See ordering information on page 10 for optional power supply. Per UL 864, if the repeater is powered by batteries it must be dedicated to only one transmitter repeater pair. If the repeater is powered by a listed supply it can support multiple transmitters. The device includes a cover tamper, pry-off tamper switch, an LED to indicate when it is transmitting, and an LED to aid in resetting the battery meter, see fig 3. For mounting to a post, use the optional post mounting kit.