Oumers Bicycle Police Sound Light, Bike LED Light Electric Horn Siren Horn Bell, 5 LED Light 4 Sounds Trumpet, Warning Safety Light, Waterproof Bicycle Lights Accessories, No Batteries in Bike LED light is waterproof, safer in water fog when riding in the rain. Mades you be seen and heard at night when riding, enables you a safer riding Four switches control 4 tone of police whistle, this bicycle horn bell powered by - 2 AA batteries (No batteries in) Easy to install and remove without tool. Attaches easily to most bicycle, suitable handlebar diameter: 24mm/1inch Fun purpose: your children can use this for fun purpose like playing police pretend play games that will be a joy for them with loud and loud sounds trumpet cycling horn bell siren Kids bike police sound light, which is a great Christmas present for your children!!