The Cygolite Dash 520 features a powerful 520 lumen extra wide, long range beam to maximize your line of sight. Designed for road riding, it uses a low profile flexible mount designed for most handlebars including aerobars. Features: 520 lumen bicycle headlight with 8 lighting modes engineered for use on roads and commuting Stand out in broad daylight with exclusive quad LED Daytime Running Lights Low profile, water resistant design only weighs 75 grams USB rechargeable internal battery lasts up to 63 hours 8 night and day modes (Boost, High, Medium, Low, SteadyPulse(R), Quad DRL Steady, Quad DRL Flashing, DayLightning(R)) Low battery indicator alerts you when a charge is needed Side light ports further highlight your presence Light mode memory saves the mode you're in before the light is turned off VersatiteTM flexible mount conveniently attaches to handlebars including aerobars Specs: Recharge TypeUSB BatteryLi-ion Lumens Front520 Weight75g