??SAFETY FIRST??This loud volume & mini size electric bike horn can reach 120 db which is loud enough to alert anyone or even people in a vehicle to your presence. Perfect bicycle accessories for you or your kids.??EASY TO INSTALL & REMOVE?? Easily mounted and secured with the stretchable straps to fixed on the handle, install or release it from the bike handlebar within 10 seconds. Suit for 0.86″-1.25″(22.2-31.8 mm )diameter bicycle handlebar.??WITH IPX4 WATERPROOF FUNCTION??bike horn can use for mountain bikes, road bikes, walking bikes, electronic bikes, or scooters, with IPX4 waterproof which can be used on rainy days??3 VOLT-CR2032 BUTTON CELL??CR2032 button cell no mercury added (Comply with EU environmental standards), leakage protection (longer lasting use), can withstand a maximum continuous current of 20mA, so our bike bell can ring continuously. It is measured to last 5000 times of ringing. It can be used for a long time and does not require frequent battery replacement.??60-Day Mone