Specialized in a variety of outdoor sports products, including outdoor cycling and more. We pay attention to product quality assurance, concerned about each product details. loud electric bike speakers have 5 modes of sound It is compatible with almost all bicycles Such as riding a bicycle, mountain bike and so on. Suitable for bicycle handlebar diameter within 25mm. Package Included: 1 bicycle horn Worked with 2 AAA batteries (Battery NOT included) Mini plastic bicycle bike cycle ultra-loud electronic bell ring horn. 100 percent brand new and high quality.