Loud Electric Bicycle HornThe maximum sound level of the bicycle speaker reaches 120 decibels. When cycling in a noisy environment, complex road conditions are prone to cause collisions. This oversized horn sound is loud enough to effectively warn surrounding pedestrians and drivers to avoid traffic accidents.Anti-theft AlarmLong press the left button (lock button) to enter alarm mode. If someone touches or pushes the bike, the bike alarm will immediately emit a loud and continuous alarm sound, so that thieves dare not approach. Long press the right button (unlock button) to exit anti-theft mode.Long Standby Time Electric Bicycle Horn Alarm, the capacity of the built-in horn is 250 mAh. It can be fully charged in 0.5 hours, can be reused 1000-1500 times and work for 20-30 days. One charge can be used for a long time, you don't have to worry about running out of power next time you use it.IPX4 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 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 applied to mountain bikes/electric scooters/racing bikes, etc.