Points:1.High Decibel: 120dB high decibel warning sound lets you drive in a noisy street without obstructing. 4 ringtones function. Double-clithe bell to switch the sound effect.2.Long Standby: Built-in 200mAh lithium battery. If preed 100 times a day, it can be used continuously for 40 days. USB charging. It can be fully charged in 20 minutes.3.Multiple Functions: Not only the bicycle bell but also the alarm with anti-theft function. Turn on the anti-theft function, when someone moves the bicycle, the horn will sound an alarm to remind (long-pre the left on to turn on the alarm, and long-pre the right on to turn off the alarm)4.QuiInstallation: It can be firmly and stably fixed with a silicone strap. The more convenient and quiinstallation and disaembly make it suitable for handlebars of different diameters (about 22.2mm-31.8mm)5.Easy to Carry: The size is about 60*34mm/2.36*1.34in. It is small and exquisite and can be inside the handlebar. So it does not affect the handlebar brake shift or the operation of other brackets, which is very suitable for your riding activities.Description:The bicycle charging horn comes with a 120dB high decibel warning sound, a built-in 200mAh lithium battery, and an anti-theft alarm function. It is exquisite, small, and portable. It can be firmly and stably fixed with a silicone strap.Specification:Name: USB Electric BellMaterial: ABSSound: 4 kinds of sounds (double-clithe speaker to switch the sound effect)Volume: 120 decibelsBattery: 200 mAhWaterproof: anti-torrential rainWeight: about 25gSize: about 60*34mm/2.36*1.34inSingle package weight: about 53gAlarm function: long-pre the left on to turn on the alarm, long pre the right on to turn off the alarmPacking List:Bell*1Strap*1USB Charging Cable*1Note:Due to the lighting effects and shooting angles, there are color differences in the product, please understand.Due to manual measurement, there is a tolerance in the product size.