Exit Door Alarm, Cylinder Type Key Lock, Alarm Type Audible/Annunciation, Siren Style Three Minute Piercing Horn, Activated By Unauthorized Egress, Alarm Duration 30 sec, 3 min or Continuously, Coverage 1000 ft, Door Handing Non-Handed, Body Thickness 2 in, Body Dia. 5 1/2 in, Decibels 105 dB, Power Source 9V Battery, Housing Material Polycarbonate, Standards FCC and IC Compliant, For Use With STI-34104 STI-34108 Wireless Alert Series