Brand new 5 LED rear light. Operation life up to 100,000 hours, never need replace. Water resisitant, shockproof, and erode prevent design, Perfect for you used under the bad outdoors environment. luminescence ultra-bright LED, soft, no flicker and lowest power-consumption. Multi-function, guiding your way in the darkness Quick release bracket, portable attach to your bicycle. Power supply:2 1.5V AAA" (not included) Package Included: 1 X 5-LED Bicycle Rear Light "