Exit Door Alarm Kit, Finish Satin Chrome, Cylinder Type Mortise, Alarm Type Horn, Siren Style Constant, Activated By Unauthorized Egress, Door Handing Non-Handed, Decibels 85 dB, Power Source 9V Battery, Standards UL Listed, ANSI A156.3-2001, Grade 1, For Use With Von Duprin(TM) 99 Series Exit Device, Includes 9V Battery