Solar Energy Bike Tail Light

No batteries,environment-friendly and economic,charge under sunlight
Three Modes: quick flash / slow flash / keep lighting
Two LED bulbs last for 4-8 hours,Waterproof.
Easily install on the chain stay, adjustable diameter from 2.2cm to 3cm,Fit more than 90% bicycles
Measures:7 x 5.5 x 2cm/2.76 x 2.17 x 0.79in