If you ride your bike on busy main roads， make sure people can hear you coming with this super loud electronic bike horn.Features:100% brand new and high qualityEasy and safe to use when braking5 kinds of sound effectsExtremely loud & clear soundCompatible with all bikes including road bikesWork with 2 AAA Batteries (Battery NOT included)Specifications:Material: PlasticSize: About 94(L) X 46.3(W) X 38 (H) mmWeight: 96g Color: BlackPackage includes:1 x Battery excluded bicycle Handlebar Ring Bell Horn （with package box）1 x Mini screwdriver