[High Decibel, 4 Sound Modes]: The sound of bike horn is loud enough to reach 120 decibels and has four sound modes, enough to alert the surrounding pedestrians of your presence and ensure your safety during riding.[Upgrade Design]: Bicycle horn with stylish and compact appearance that complements your bike. Fixed by straps, which is easier to install and disassemble, no tools required, easy to use.[Anti-theft Alarm]: Long press the left button of the bicycle horn to enter the early warning state. If shaking or vibration is sensed after that, the super bike horn will immediately emit a loud alarm to protect the safety of your bike.[USB Rechargeable]: The bike horn for adults built-in USB rechargeable battery, easy to use. Fully charged in 20 minutes, this 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, the loudest bike horn can be used in rainy days, regardless of weather factors, fully meet your outdoor riding needs.