Features: High decibel, 4 sound modes: This bicycle horn emits a loud sound of up to 140 decibels and offers four sound modes to ensure pedestrians notice your presence and guarantee safety when cycling. Upgraded design: Stylish and compact appearance, perfectly matching your bike. Attached with straps, easy to install and remove without tools. Anti-theft alarm: Press and hold the left button to activate the alarm mode. If shaking or vibrations are detected later, the horn emits a loud alarm to protect your bike. USB charging: Built-in USB rechargeable battery for convenient use. A full charge takes only 20 minutes, and this electric bicycle horn can be used for 30-40 days, 3000-4000 ringtones, and has a standby time of up to 180 days. Waterproof and durable: IP65 waterproof, dustproof, and drop-proof rating ensures normal use in rainy and other harsh weather conditions, meeting the needs of outdoor cycling. Specifications: Color: Black; Material: Plastic; Package contents: 1 x Electric bicycle horn; 1 x USB data cable; Note: Light during shooting and different monitors may cause the color of the item in the picture to differ slightly from the actual product. The measurement error is +/- 1-3 cm.