Features1120db high volume ring is loud enough to notice the passersby and surrounding drivers and ensure security for your riding and cycling. 2Compact body and lightweight feature makes it can be hidden under the handlebar and but not affect the normal operation of hand brake, shift or other bracket operations. 3With builtin 280mAh lithium battery, and standard android USB charging cable, only 1.2 hour or so the battery can be full, and continuous bell can reach 2000 times for 2030 days normal use. 4Waterproof, dustproof, antifalling. Very practical and useful to meet your normal daily use. 5Split handle controller with the speaker in the form of separation, is installed in the handle next to the thumb for easy operation.SpecificationFeatures:120db high volume ring is loud enough to notice the passers-by and surrounding drivers andensure security for your riding and cycling.Compact body and lightweight feature makes it can be hidden under the handlebar and but notaffect the normal operation of hand brake, shift or other bracket operations.With built-in 280mAh lithium battery, and standard android USB charging cable, only 1.2 houror so the battery can be full, and continuous bell can reach 2000 times for 20-30 daysnormal use.Waterproof, dust-proof, anti-falling. Very practical and useful to meet your normal dailyuse.Split handle controller with the speaker in the form of separation, is installed in thehandle next to the thumb for easy operation.The controller with two buttons: one button to control three modes of sound: whistle, hornand alarm; the other one is the key to ring the bell.Easy to install it on handlebars by using the stable fixing band, and its applicablehandlebar diameter range is 22-31.8mm. Specification: Condition: and High QualityMaterial: ABS + PCSound Mode: Whistle, Horn, AlarmSound: 110 - 120dbBattery capacity: 280mAh(Built-in)Power Supply: USB cable chargingCharging Time: About 1.2HoursWaterproof Level: IP65Applicable Handlebar Diameter: Approx. 22 - 31.8mm / 0.87 - 1.25inchSize(L x W): Approx. 66 x 49mm / 2.6 x 1.9inchWeight: Approx. 75 - 77gPacking List: 1 x Bicycle Bell 1 x Fixing Band 1 x USB CablePackage List1 x Bicycle Bell1 x Fixing Band1 x USB Cable