Points:1,【Loud Bell Horn】The Electric Bike Bell has 80 decibels, which can effectively remind pedestrians and vehicles. Also, it has six kinds of sounds to switch, just pre and holds the switch for 2 seconds.2,【USB 】Electric Bike Horn supports USB charging for longer battery life, and at the same time, the built-in 150mah lithium battery will keep you continuously in use.3,【High-quality Material】The Bike Bell and Horn are made of high-quality ABS and rubber pads, making the bike horn waterproof and more stable and durable for long-term use.4,【Convenient to Install】The Electric Bicycle Horn is very easy to install, no tools are required. You can install or uninstall it on your bike handlebars in minutes.5,【Wide Range of Applications】These Electronic Bicycle Bells with elastic silicone straps fit handlebar diameters from 22~31.8mm and are adjustable to fit different diameter handlebars.Specification:Material: ABSSize: about 4*4cm/1.57*1.57inWeight: about 35gApplicable: handlebar diameter is 22~31.8mm/0.87~1.25inColor: black, cd greenBattery: 150mah lithium batteryFeatures: 150mah lithium battery, six kinds of sound, high decibel, etc.Product List:1*Electric Bike Bell