Electric Bike Horn/ USB Rechargeable Bicycle Bell SMALL BUT LOUD - This electric bike horn is build in voltage boosting circuit, ringing sound up to 120dB,lond enough to warn people you are coming,keep both safe in crowded. EASY TO INSTALL & REMOVE - To install this electric bike horn,simply put the bike bell to the handlebar and use the silicon buckele to fasten it.,about 40 grams weight do not add much load to your bike and do not take up a lot of space on the handlebar. USB RECHARGEABLE BICYCLE BELL - Built-in 280mAh lithium battery, equipped with USB charging port,1.5 hours fully charged can use for 20-30days,ringing 1000-1500 times and standby for 180 days. FITS MOST - Too Goods Rechargeable Bike Horn can attach to mountain bikes, road bikes,BMX, and Scooters which handlebars diameter is 22.0-31.8mm.The silicone rubber band can be adjustable in 2 level. MULTIFUNCTIONAL BIKE BELL - Waterproof,drop resistant and dustproof,3 Modes Sound ( Whistle,Horn sound,Alarm sound) for different situations. Long working life,charging & discharging over 300 times.press over 20 million times,stand by over 180 days. Separated multi-function control button.Install it to any position you like. The horn in a proper size can be hidden inside the handlebar, so it won't affect the operation such as braking, shifting gears on the handlebar or other operating motions. Specifications: Weight:40gvSize:49*66mm Material:ABS+PC Decibel:110-120db Charging time:1.2 hour Battery capacity:280mAh For Handlebar: 22-31.8mm diameter Color:Shown as picture Charging Voltage & Current5V-250mAh Charing indicator: Red (Charging), Green (Full) Waterproof Level: IP65,please remember close waterproof cover after charging. Package Content: 1x Electric bike horn with control button 1x Silicone rubber band 1x USB charging cable 1x User Manual