OnvianBike Alarm with Remote 2 Pack,113dB Wireless Bike Security Alarm Waterproof Anti-Theft Motorcycle Alarm Vibration Motion Sensor Security for Bicycle,Mountain Bike, Motorcycle, Electric Scooter

Pros: very loud which is most important for anti theft, and vibrations threshold are sensitiveCons: not the easiest to understand how to program settings

I use them on my back and side door. They are extremely sensitive and alarm will definitely wake me up if there is the slightest movement of the door. I tested it by locking the door with a dead bolt and my wife set the alarm. I went outside and as I put the key in the key hole and before I had a chance to turn the key, the alarm sounded. Very impressed. Definitely recommend.

To Warn off would be thieves

For the price, great deterrent

Works okay