【CLEAR AND LOND SOUND】 Small size, big energy. The sound of bike bell is clear and loud. The highest decibel reaches 100db. Even on a noisy road, can warn passing vehicles and people. 【QUICK INSTALLATION】Our bike bells for adults fit standard bicycle handlebar sizes of 22.2 mm/25.4 mm/31.8 mm. Wide application and easy to install. Only one screw can finish installation (The tool is provided in the package). 【DURABLE & STURDY】Our bicycle bell was made of high-quality aluminum alloy and PC. Sturdy and rust-resistant material, so you don't have to worry about using it in rainy or snowy weather. 【HIDDEN DESIGN】 The size of mountain bike bell is 62✖48✖22.8 mm, space-saving, you can store more bike accessories on the handlebar. The hidden design is not easy to attract attention and will not affect the aesthetic of bike. Ideal for those who like to keep a low profile. 【ROCKBROS SERVICE】 ROCKBROS bike horn offers 12-month warranty and replacement service. If you have any dissatisfaction, please feel free to contact us. bike bells for adults mountain bike/ mountain bike bell/ kids bike bell/ bicycle bell for adult bikes/scooter bell Are you looking for a bike bell which is small size but big energy. You should to try this. The highest decibel of our bike horn for adults reaches 100db. Even on a noisy road, can warn passing vehicles and people. The size of bike bell is only 62✖48✖22.8 mm. If you attach choose one color similar to your bike, it would not be found easily.