Smart AirBell bicycle bell made from hard plastic with holder for a Bluetooth-tracker (not included), so you can always find your bike. The “Find my” network lets you know exactly where your bike, e-scooter or e-bike is. Suitable for handlebars with a diameter of 22 mm, the standard size for most bikes, e-bikes and children's bikes. The design is simple and sleek. Comes with a screwdriver for easy installation and opening the AirBell.