Led Flash Tyre Wheel Valve Cap Light For Bike Bicycle (4 Pack 2 colors) Durable, High Impact, Rust Resistant, Auto shining No switch. Dimensions: 2.9x0.5x0.5. Enhances safety by increasing visibility at night and during bad weather conditions. Batteries: Requires 3 x AG10 button batteries per light (included). Package includes 2 Orange and 2 Blue lights.