[High decibel, 4 sound modes]: The sound of the bicycle horn is loud enough to reach 140 decibels and has four sound modes, enough to warn surrounding pedestrians of your presence and ensure your safety while cycling. [Upgraded design]: bicycle horn with a stylish and compact design that complements your bike. Attached with straps, making it easier to install and disassemble, no tools needed, easy to use. [Anti-theft alarm]: Press and hold the left button on the bicycle horn to activate early warning. If shaking or vibration is detected afterwards, the super bicycle horn will immediately sound a loud alarm to protect your bike's safety. [USB rechargeable]: The bicycle horn for adults has a built-in USB rechargeable battery, easy to use. Fully charged in 20 minutes, this electric bicycle 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 shockproof, the strongest bicycle horn can be used on rainy days, regardless of weather factors, fully meets your needs for outdoor cycling. Color: Black Material: Plastic Package contents: 1 x Electric bicycle horn 1 x USB cable. Only the above package content, other products are not included. Note: Light shooting 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 +/- 1-3 cm.