Cygolite's Expilion 680 utilizes a one pience design, a powerful Cree XM-L LED and refined optics to light up the road or trail. 680 lumens turn night into day, and run time is 1 1/4 to 22 hours depending on which of the 8 modes you select. It has a high, medium, low, and boost mode as well as flashing and walking modes. The unique SteadyPulse mode alerts night time motorists with pulses of light while still constantly lighting your path. Need more run time? No problem! The Expilion uses swappable Li-ion battery sticks (sold separately) to power you through the night without stopping to recharge. For added convenience, it includes a handlebar mount and charges through any USB.