The Detex EAX-500 is a surface-mounted door alarm designed for security and loss prevention. It's used to monitor unauthorized door openings in commercial and industrial settings. When a door is opened, the EAX-500 emits a loud alarm, deterring intruders and alerting personnel. This self-contained alarm is easy to install on various door types and provides a reliable security solution. https://partsfe.com/eax-500-detex-alarm-door-surface-mt-detex