Review on 🚲 USB Rechargeable Bike Alarm with Remote - 110dB Loud Wireless Anti-Theft Vibration Motion Sensor Security System for Bicycles, Trailers, and Motorcycles - Waterproof Vehicle Alarm by Junee Mauck

This alarm was bought to mount on a bike rack when we need to stop with bikes on the rack (e.g. for lunch). I love the fact that it's a standalone device that's rechargeable with no extra batteries or cables. It's loud enough and the vibration sensitivity is just right (and still adjustable), emitting a short warning beep on first contact and then a full alarm. It's a straightforward product and easy to remove (I don't even bother locking it) but it's a good cheap deterrent that can protect you from casual thieves.