About this item [5 Types of Sounds]: There are three models of sounds, loud but not harsh; Press it to switch, 5 sound modes optional [Strong Sound Penetrating Power]: This bell is as loud as 120 decibels enough to alert pedestrians, vehicles, or children who suddenly rush out [Bike E-bell]: Environment-friendly, our bicycle bell built-in 2pcs button battery; A beautiful bike should be accompanied by a nice bell, this is a good-looking, high-decibel electric bicycle bell; Can be put directly into the pocket, light and small, and also can be used as a finger bell [Easy to Use]: Simple and quick installation for its back hook, which is very convenient and quick [Applicable to Most Cycling Bicycles]: bicycle electric bell is suitable for mountain bicycles, road bicycles, urban bicycles, small motorcycles, MTB, etc