Features: High Decibel, 4 Sound Modes: The bicycle horn emits a loud sound reaching up to 140 decibels and offers four sound modes, ensuring pedestrians are alerted to your presence for safety during cycling. Upgraded Design: Sleek and compact appearance that complements your bicycle. It attaches with straps, making it easy to install and disassemble without requiring tools. Anti-theft Alarm: Long press the left button to activate the warning mode. If shaking or vibration is detected thereafter, the horn will emit a loud alarm to protect your bicycle's safety. USB Rechargeable: Built-in USB rechargeable battery for convenient use. Fully charged in 20 minutes, the electric bicycle horn can be used for 30-40 days, ring 3000-4000 times, and have a standby time of 180 days. Waterproof and Durable: IP65 waterproof, dustproof, and shatterproof, ensuring usability in rainy conditions and meeting the needs of outdoor cycling. Specifications: Color: Black Material: Plastic Package Contents: 1 x Electric Bicycle Horn 1 x USB Cable Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.