Detex EAX-500-BK Battery Powered Door Exit Alarm Surface Mounted, Black, Key Bypass Shutoff

Low cost, easy to install, self-contained door alarm with piezo horn that sounds to warn unauthorized use of a door. Tapered cover allows for installation on narrow stile doors, 2" minimum. Alarm can only be silenced by proper control key. -Specifications- Dimensions: 2.10" Width x 2.375" Depth x 7.70" Length Installation: Surface door mount only Cylinder: Mortise cylinder optimal length 1-1/8" (not included) Power: 9VDC battery operated with Low Battery Alert Alarm: 100dB piezo alarm