Features:120db high volume ring is loud enough to notice the passers-by and surrounding drivers and ensure security for your riding and cycling.Compact 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.With built-in 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 20-30 days normal use.Waterproof, dust-proof, anti-falling. Very practical and useful to meet your normal daily use.Split handle controller with the speaker in the form of separation, is installed in the handle next to the thumb for easy operation.The controller with two buttons: one button to control three modes of sound: whistle, horn and 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 applicable handlebar diameter range is 22-31.8mm.Specification:Condition: Brand New and High QualityMaterial: ABS + PCColor: Black, Pink, Red, Green, Blue(Optional)Sound Mode: Whistle, Horn, AlarmSound: 110 - 120dbInput voltage: 5V - 250mABattery 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 Band1 x USB Cable.