Electric bicycle horn - equipped with wireless bicycle horn switch, which can be easily clamped on the 0.87~1.51 inch handlebar. When the horn is pressed, it can emit a sound of 113 decibels to let the car/pedestrian/driver know that you are coming Vibration alarm - The anti-theft alarm triggered by vibration can effectively stop thieves, provide additional security, and make you feel at ease. Two in one function of alarm and horn, affordable and practical bicycle accessories Super blinds and adjustable sensitivity - up to 113 dB with 3 adjustable volumes. Level 7 adjustable sensitivity, from light touch to press or beat. IP55 waterproof, suitable for outdoor use 66 foot remote control - The bicycle alarm is remotely controlled by wireless, with a wireless range of up to 66 feet. The vehicle search function can easily find your vehicle in the parking lot. 3 bicycle ringtones for your choice Easy to install and use - Easy to install, like bicycle accessories, including batteries and everything you need. Applicable to bicycles, electric bicycles, motorcycles, scooters, trailers, luggage, etc Function: Inductive vibration host alarm, remote control, wireless control, 3 kinds of car search ringtones, SOS tipPrinciple: vibration sensor senses vibrationFrequency: wireless 433 frequencyBattery: three No. 7 batteries of the main unit (normal 3~4 months), one 12V27A remote control (more than one year)Default shipment with battery (removable battery)Wireless remote control distance: 10~25m, 80~100mAlarm sound: 113dB