Product Description Material: ABS+PC Size: 6.6 * 4.9 cm Battery capacity: 280 mA Waterproof rating: IP65 Color: black, red, blue Quantity: 1 piece Package content: 1 piece * charging car bell Compatibility: Two-speed adjustment, suitable for various handlebars of 22-31.8 mm 1. More safety Very loud bike bell up to 120db for more safety, especially when riding a bike in the dark, a sufficiently loud bell can warn other road users (and at the same time do not disturb them) to stay a safe distance from the driver . 2. Long working hours USB rechargeable Bike Ring, 1.5 hours full charge for 2000 continuous uses, about 20 to 30 days in operation, and 180 days on standby. 3. Multiple switching modes This bicycle bell has 4 sound modes for different environments: horn, whistle, alarm, vibrating bell. Independent multifunctional buttons for switch and mode switch. The ring strength can be adjusted for different uses. 4. Multi-protection for longer service life Dustproof, anti-fall, IP65 waterproof, suitable for outdoor activities. 5. Universal for all common bicycles Easy assembly, no tools are required, with a Velcro fastener you can use it on various bicycles such as MTB / racing bike / BMX with handlebars from 22-31.8mm.