Features: High decibel, 4 sound modes: The bike horn emits a loud sound of up to 140 decibels and offers four sound modes, ensuring pedestrians are warned of your presence for safety while cycling. Upgraded design: Stylish and compact appearance that complements your bike. It is attached with straps, making it easy to install and remove without the use of tools. Anti-theft alarm: Long press the left button to activate early warning. If shaking or vibrations are detected afterwards, the horn emits a loud alarm to protect the bike's safety. USB rechargeable: Built-in USB rechargeable battery for easy use. Fully charged in 20 minutes, the electric bike horn can be used for 30–40 days, ring 3000–4000 times, and stand by for 180 days. Waterproof and durable: IP65 waterproof, dustproof, and shatterproof, ensuring usability in rainy weather and meeting the needs for 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 product in the picture to differ slightly from the real item. The allowed measurement error is +/- 1-3 cm.