Product Features: 2 x Skull valve cap/ wheel lamp Suitable for the auto, motorcycle, mountain bike, folding bikes Increase night-time and bad weather visibility for safety Revolve switch to turn on/turn off Easy to install and replace Power supply: 3 x AG10 button cell Note: Color of the item might be sent at random Gross weight: 32g Size: 20 x 20 x 55mm (L x W x H) Package Contents: 2 x Wheel lamp 6 x AG10 button cell