CycleBeam 700 Lumen Helmet Light Small Sized and Light Weight for Your Helmet: only 6 oz (167 grams) with battery included Extremely Bright: CREE XM-L2 LED Bulb Multiple Mode: HI/MED/LO/Strobe/SOS Mode Memory: The micro chip controlled light remembers the mode you were using. 2-in-1 USB Connector: Charging the battery + Turn the battery into an emergency power bank for your smart phones