NiteRider (5084) Solas 100 7.5 hour run time on Daylight Visible Flash Mode. 15.5 hour run time on Group Ride Mode (Steady Low). Multiple light modes: 2 light levels Plus 2 Daylight Visible Flash modes Daylight Visible Flash (DVF): Riding with a bright tail light in the daylight is every bit as important as at night Efficient USB Rechargeable Low Battery Indicator: Upon powering off, indicator flashes blue indicating more than 20% battery level. And will light up red when below approx. 20% remaining. Lifetime warranty: Covers any defects in mechanical components (housings, covers, mounts and fasteners) and LEDs FL1 Standard IP64, dust and water-resistant Easy to install seat post strap mount with angle adjustment capability