High Volume Electric Bicycle Horn The maximum sound level of the bicycle speaker reaches 120 decibels. When cycling in a noisy environment, complex road conditions are prone to collisions. This oversized horn sound is loud enough to effectively warn surrounding pedestrians and drivers to avoid traffic accidents.Antitheft alarm Press and hold the left button lock button to enter the alarm state. If someone touches or presses the bicycle, the bicycle alarm will immediately emit a loud and continuous alarm sound, so that thieves do not dare to approach. Press and hold the right button unlock button to exit the antitheft mode.Long standby time Electric bicycle horn alarm, the capacity of the builtin horn is 250mAh. It can be fully charged in 0.5 hours, can be reused 10001500 times, and works for 2030 days. One charge can be used for a long time, you dont have to worry about the battery running out next time you use itIP4 waterproof and USB charging The bicycle bell is waterproof and can be used on rainy days. The electric bicycle horn alarm uses USB charging and can be charged in various ways, such as with plugs, power banks and laptops.Easy installation The bell does not need to be installed with complicated tools, just attach the silicone bicycle horn alarm strap to the handle, and the strap is elastic and durable. This bell is suitable for bicycle handlebars with a diameter of 22.2 to 31.8 mm, which can be used on mountain bikes, electric scooters, racing bikes, etc.