2 Pack Window Alarm Ultra Slim Vibration Alarm 130dB Window Alarms for Security Shed Door Alarm Sensor Glass Break Alert Alarm Sensors for Home, Office, Dorm Room, RV

Really affective and super loud

We got them to put on our street-facing windows after an attempted break in.They're not too sensitive, i.e. slamming the front door doesn't trigger them.They're very loud when they go off, so will definitely scare off anyone not expecting them.They've gone off a couple of times when things have knocked against the windows, so that's a good sign.Hopefully i'll never need to find out whether they're triggered by someone trying to smash a window again.

easy to fit and are loud

Work

I wasnt to sure if these would be any good but their excellent and I would recommend. There nice and loud.

I was expecting the vibration would be more sensitive. I think sensitivity should be increased or regulated on the device itself.

These are brilliant little guys nice and loud too

These vibrator alarms are good. BUT it takes quite a bir vibration to set them off. I fitted one to my back door, I then thumped the door with my fist quite hard, but the alarm did not activate. If you tap the case of the alarm with a coin or something solid it will activate.