-100% Brand New Electric Bicycle Horn -Loud and effective electronic horn -Great for town and city riding where audible presence is required -Fits all handlebar types and sizes and is easy to fit -Water resistant construction for year round use -With 6 different and loud sounds, increase the safety -Sound button is very comfortable and sensitive -Waterproof design, so also can be used on rainy day -Fine workmanship and waterproof -Easily install and fits all kinds of bicycle whose hand-bar diameter is 20~25mm -Power is 9V battery included for long time useUSA