Richly&reg;1000lm CREE XM-T6 U2 LED Flashlight Torch Bike Headlight, Sports Mountain Bicycle Headlight, Packaged with Bike Tail Light LED Light Source: CREE XM-T6 U2 LED, super-bright and low light attenuation. Dimensions: Length 5.32", Head diameter 1.34" and body diameter 1.25". Five Modes: High, middle and low beam, strobe light and SOS light. Battery Powered: A piece of 3.7V 18650 lithium ion battery. Richly After Service: 30 Days Money Back Guarantee, 12 Months Warranty!