The EAX-500 Door Exit Alarm is easy to install on a Door or Wall by surface mounting and is designed for applications that require an alarmed exit device on secured doors. The exit alarm has an approximately 100dB siren which will sound when someone attempts an unauthorized exit. With it's redesigned shape and smaller size, it is the choice for quick and easy installations on emergency exits and restricted doors. The Detex EAX-500 is available Less Cylinder (Standard) or with an MC65, Schlage "C" Keyway cylinder.