CYGOLITE Dash– 600 Pro, 520, 460 Lumen Bicycle Light Models– 5 Night & 3 Daytime Modes– Ultra Compact– IP64 Water Resistant– Sturdy Flexible Mount– USB Rechargeable– for Aero Road, Commuter Bicycles Black Brown It allows a tight fit It allows a tight fit of the backpack but gives that extra freedom to breathe and move Expandable flex joints improve overall finger mobility Medium (1:15) tail light features 5 modes Both feature SteadyPulse mode to alert motorists with attention grabbing pulses while its overlapping steady beam constantly lights the way at night Both feature DayLightning to make you stand out in broad daylight with lightning like flashes Low battery indicator alerts you when a charge is needed Light mode memory saves the mode you're in before the light is turned off VersatiteTM flexible mount conveniently attaches to most standard and aero stylesRun Times8 HEADLIGHT MODES (run time in hours): Boost (1:15)