SMALL COMPACT AND HIGHLY VISIBLE DESIGN sits directly behind seat post for a clean and sleek set-up. The seat post strap mount allows for light angle adjustments. Dual LED strips allow for nearly 360 degrees of visibility CONVENIENT USB RECHARGEABLE rear bike taillight that is easy to charge, eliminating the need to replace batteries on a regular basis. Can be recharged from any powered up computer, device or AC wall adapter. USB charging cable included. OPTIMAL VIZ for increased visibility while out on the roadways. Cars and motorcycles are incorporating daytime running lights for increased daylight visibility. And with drivers more distracted than ever, we think cyclists should as well POWER MANAGEMENT with the Low Battery Indicator; While powered on, the power button/indicator will light up red indicating a low battery level at or below 20% power remaining. 6 VARYING LIGHT MODES Bullet 200 Run Times: Fast Flash - 16: 00h, Steady w/ Fast Flash - 14: 30h, Alternating Flash - 16: 00h, Pulse Flash - 10: 00h, Steady High - 11: 45h, Steady Low - 29: 15h WHAT'S INCLUDED? Daylight Visible LED Taillight, Internal Li-Po Battery, Rubber Seat Post Strap Mounts (2) and USB Charging Cable FITS STANDARD AND AERO seat post sizes and shapes vary. Designed to fit Standard to Aero seat posts using the interchangeable mount system. SUPER BRIGHT LEDs taillight that utilizes a multi-LED array designed for eye catching visibility in both day and night. IP64 RATED WATER AND DUST RESISTANT utilizing gasket sealing, tuned to withstand diverse riding conditions and environments. LIMITED LIFETIME WARRANTY: Covers any defects in mechanical components (housings, covers, mounts and fasteners) and LEDs.