Safety Technology International, Inc. STI-34400  Wireless Universal Alert - Part of the Wireless Alert Series Will let you know if a monitored site is tripped Has a supervised battery and signal reception Operates up to 1000' (line of sight) Includes 3 volt lithium battery (estimated battery life is 5 years with normal use) Can be used as an on board reed switch, set of terminals (remote) or as a tilt switch