Solar Energy Power Bike Bicycle LED Cycling Tail Rear Red Light Waterproof Lamp Taillight w/ Clamp (No Batteries Needed) Brand New & High Quality 2 Bright Red LED,Waterproof. Solar powered,Solar power panel: 4 x 3 cm, Charge under sunlight .Flash model: swift flash, pausal flash, continuing light Size: tail-light-705520mm, hoop-diameter 22-30mm