The 12-14v DC version of this transmitter is perfectly suited to primary cell or lead acid battery operation as their standby current is below 300 micro amps. A mains powered version (PSCPUHF) is also available, with optional battery backup to cover in the event of mains failure. The transmitter is equipped with 4 volt-free trigger inputs which can be operated in a normally open or normally closed mode. Zone 4 is also able to support a +12 volt trigger. When a zone is triggered, the pager will display the active zone number, together with an identifying beep type or vibrate pattern. The transmitter can be configured to send repeat calls at preset intervals.