Features: 1.Whether you employ it to commute to work, for train, or for enjoyable, a bicycle is an funding you may need to shield. 2.Where as a lock is a superb first step in maintaining your journey safe, an alarm will deter potential thieves and draw consideration if anybody makes an try to steal it. If a thief touches or pushes the bike, the alarm will emit a rapid and continuous loud alarm when it is shaken. 3.Suitable for road bikes, mountain bikes, kids bikes, city bikes or other types. It can be stored directly in a pocket or bag when not in use. 4.This bike bell cover is made of with soft silicone material, which will not damage the bike paint, the dustproof design greatly extends the service life. 5.Easily mounted and secured with the stretchable straps. No tools needed. You can install or uninstall it on your bike handle bar within 20 seconds. Notice: *Actual color may be slightly different from the image due to different Display and light effect *Please allow 1-3cm deviation due to manual measurement : Package Size: 7.5* 4.5* 3.5cm includes: 1 set x 2 in 1 Bike Alarm Bicycle Horn