Features:1. Easy to install2. No batteries, environment-friendly and economic3. Charge under sunlight4. Two LED bulbs last for 4-8 hours5. Easily install on the chain stay, adjustable sizeSpecifications:Material: plastic + solar chipSwitch: push button switchColour: blackLight bulb: 2 LEDsWeight: 100gBattery: no battery, solarCharging instructions: direct solar charging, long light mode can be on for about 4 hours, flash mode is more than 8 hoursShining mode: three flashing modes - quick flashing; flashing; long brightDimensions: taillight length 70 width 55 thickness 20mm; deck diameter 22-30mmPacking content:1 x Solar Powered Bike Tail LED1 x Adjustable Clamp includes:1 x Solar Powered Bike Tail LED1 x Adjustable Clamp