The horn is easy to use, just quickly squeeze the rubber ball and loose it to generate the sound. The horn is crisp and loud, easy to draw attention from the pedestrian and avoid the dangerous situation Made of high-quality aluminum alloy material and advance rubber, waterproof and rust-proof. Light weight and durable. Easy installation, mount part is fit for universal handlebar with 22.2mm diameter. Dimensions: 180 mm x 75 mm x 65 mm (7 inch x 3 inch x 2.6 inch), mount: dia. 22.2mm.