Safety Technology International, Inc. STI-6402 105 dB Exit Stopper® Multifunction Door Alarm for Double Doors with on/off Switch and 9 Volt Battery

Its very usefull to install in emergency doors! Have a good control and has a easy instalation.

Took only 35 min to put on fire escape door! No more folks sneaking out!

I put this alarm product on an outbuilding as a door alarm, using the alarm extension as a door trigger and mounting the box next to the door. The basic electronic design allows for a number of configurations and you can use it to trip outboard visual alarms with the onboard NO/NC relay contacts. Over and above using it for alarming a secured exit door it is versatile enough to create a multi sensor basic alarm system. If you had the motivation, you could use it for a two zone home alarm system. Works as an entry alarm as well as an exit alarm.

Met my needs and expectations

Easy to install, really loud!

Easy to install and use in all doors and windows

As promised

Alarm was bought in February 2017. Alarm stopped working in June 2017. Did not even last 5 months.