Ride with Safety :: One of the world’s loudest bike horn, the Airzound has an adjustable volume switch that offers up to 115 decibels. Its loud enough to reach inside vehicle cabins, instantly grabbing attention.` Compact & Rechargeable :: Compact horn design with no batteries required, our bike horns for adults loud recharge with your bike hand pump. Saving time and money, the air reservoir stores in any standard bottle cage or zip ties to your frame. Reliable Quality :: With weatherproof molded thermoplastic and a tough PET bottle, our bike horn loud offers long-lasting durability. Come rain, sleet and snow, it functions in any condition for year-round use and safety. Easy to Install :: Whether you ride a hybrid, single speed or road bike, our loud bike horn is compatible with handlebars 22-26mm in diameter. With hardware included, it clamps securely in place for a quick, easy setup.