Specifications:Quantity of LED: 32Color of light: Blue， green and redMaterial: ABS & PVCSwitch type: Button (on and off )Diameter of applicable wheel: 20in and aboveDiameter of applicable bike hub: 18-40mmLED light size: 38 * 3 * 2.2cm / 15 * 1.2 * 0.9inLED light weight: 66g / 2.3ozPackage size: 40 * 7 * 3cm / 15.7 * 2.8 * 1.2inPackage weight: 120g / 4.3oz