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.