Exit Door Alarm Kit Finish Satin Aluminum Cylinder Type Mortise Alarm Type Horn Inside Keyed Cylinder Type Mortise Siren Style Horn Activated By Unauthorized Egress Alarm Duration Variable Door Handing Nonhanded Body Length 36 in Decibels 85 dB Power Source 9V Battery Housing Material Aluminum For Door Thickness 1-3/4 in Standards ANSI 156.3 For Use With 98 Series Exit Devices Includes 9V Battery