Features: 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 6 feet, the large capacity of 700mAH 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: Built in 700mAh battery, working time is 1-3 mouths to full charge, standby time is 6 mouths. Made of high quality PC+ UV protection mterial, IPX5 waterproof design, can be used on rainy day. 4. Wide Use: This durable bicycle tail light horn is easy to install and suitable for Electric bike, mountain bike, road bike, folding bike, scooters, etc. 5. Adjustable Sensitive: 7 levels adjustable sensitivity, you can easily set it up according to your need. Wireless remote control operation, USB rechargeable. Specification: Material: PC+ UV Protection Material Product Color: Black Package Size: 14 x 10 x 4cm Package Weight: 145g Waterproof: IPX5 Optional: One Remote Control, Two Remote Control Package Included: 1 x USB Bike Tail Light Alarm With Remote Control