Specifications:Product Features:- Easy and safe to use when braking- 5 kinds of sound effects- Extremely loud & clear sound- Compatible with all bikes including road bikes- Work with 2 AAA Batteries (Battery NOT included)Product Name: Bicycle Ring BellMaterial: PlasticSize: 94 x 46.3 x 38mmWeight: 200gColor: BlackPackage Weight : 108 G / 3.81 OuncesPackage Dimensions (L*W*H) : 100*100*100 MM / 3.94*3.94*3.94 InchesRetail Packaging: Yes, General BoxPackage Include:1 x Ring Bell1 x Mini Screwdriver