Perfect for cyclists who are serious about commuting AND saving time, the CygoLite Dash 320 USB Headlight has a USB rechargeable internal Li-Ion battery that juices up in only three hours! 3-watt Cree LED projects 320 lumens of powerful light and features Enhanced Cycling Optics for a wider beam spread. Side illumination ports make your presence known to motorists and other pedestrians on the road. Seven light modes have runtimes ranging from 1¼ hours in High mode to 55 hours in Quad LEDs Flashing mode. This headlight also has advanced features like the exclusive DayLightning mode, which boosts over 500 lumens of lightning-like flashes for increased daytime safety, as well as battery status indicators, light mode memory recall and water-resistant construction.