Looking for a light that is at home on the mountain bike trail as well as the commute home? Look not further than our USL-505. It's lightweight, powerful, and great run times. Features Include: 505 Lumen Output Industry Leading LED Heat Sink Technology For a Longer And Bright Light Output Side Lighting For a 180 Degree Visibility USB Rechargeable Handlebar Bracket Included Helmet Bracket Compatible Weight: 143 Grams With Bracket Modes: Overdrive, High, Medium, Low, and Flash Run Time: Overdrive = 2.25hrs, High = 3.5hrs, Medium = 7.25hrs, Low = 11.5hrs, Flashing = 8.25 hrs Battery: Integrated 1-Cell Lithium Ion