Feature: 1. High decibel ringtones, small size, large volume, built in booster circuit, the sound reaches 120 decibels to escort riding. 2. Exquisite and small, it can be hidden inside the handlebar without affecting the handlebar braking, gear shifting or the operation of other brackets. 3. Built in 280mAh lithium battery, supports USB charging, can be fully charged in 1.2 hours, and can be used for about 20-30 days with one charge. 4. Waterproof, drop proof and dust proof outdoor design, please close the waterproof cover after charging to avoid rain washing. 5. The silicone band makes installation and disassembly quick and easy, and the silicone ring can be adjusted in two levels for stable installation. 6. Split multi function buttons, convenient for pressing keys and switching sounds, installed beside the thumb of the handle, easy to use. Specification: Item Type: Bike Horn Material: ABS+PC Decibel: 110-120dB Charging Input: 5V-250MA Battery Model: Lithium Battery Battery Capacity: 280MAH (Built In Lithium Battery Shipped) Application: Mountain Bikes, Road Bikes, BMX Scooters . Package List: 1 x Horn 1 x USB Charging Cable 1 x Silicone Strap 1 x Manual Note: Long press the ring button, the ringtone will not ring all the time, press the ring button quickly, the ringtone will only rering one at a time, and will not ring continuously.