It is suitable for riding in various noisy environments, and the horn sound can remind pedestrians and vehicles to avoid traffic accidents. Control switch and cycling horn are separated, Because you can install the control switch in the place where your finger can reach it easily. Design with small size and modern fashion look.built in boost circuit with loud sound reached 80~130 db With rechargeable 280 mAh lithium battery .USB cable charge 1.2 hours full charge. Fits most - KEWAYO rechargeable bike horn can attach to mountain bikes, road bikes,BMX, and Scooters which handlebars diameter is 22.0-31.8mm. Multifunctional bicycle bell - waterproof,drop resistant and dustproof, mini size & the volume selection is low, medium and high, Loud Volume.Minimum Compatible Size: 22 Millimeters. Mounting Type: Handlebar. Item Weight: 36 Grams. Style: Bike Bell,electric,modern. Material: Silicone, Rubber. Brand: KEWAYO. Color: Black. Date First Available: August 14, 2015. Best Sellers Rank: #333,967 in Sports & Outdoors. Customer Reviews: 3.9 out of 5 stars 248 ratings 3.9 out of 5 stars. : B013VY8YAY. Style: ?Bike Bell,electric,modern. Part Number: ?KTCH01. Manufacturer: ?KEWAY. Material: ?Silicone, Rubber. Color: ?Black. Brand Name: ?KEWAYO. Item Weight: ?36 Grams. Package Weight: ?0.06 Kilograms. Item Package Dimensions L x W x H: ?4.61 x 2.72 x 1.77 inches.