1. [Anti-Theft Alarm]If a thief touches or pushes the bike, the alarm will emit a rapid and continuous loud alarm when it is shaken; the locking and unlocking are controlled by the equipped remote control, and the remote control distance is as far as 70m; the large capacity of 780mAH can exceed Long standby time. 2. [One-Click Bicycle Search]When your bicycle is parked in a large parking lot, you can use the equipped remote control to click the bell button, and the bike alarm will emit super decibels to help you quickly find the bicycle. 3. [Built in Lithium Battery]Come with USB charger, 5-6 hrs to full charge, which can work 20-30 days. Made of high quality aluminum alloy, waterproof design, can be used in rainy day 4. [Wide Use]This durable bicycle horn is easy to install and suitable for Electric bike, mountain bike, road bike, folding bike Scooters etc 5. [Adjustable Sensitive]3 levels adjustable sensitivity, you can easily set it up according to your need. Wireless remote control operation, usb rechargeable, low battery electricty display