The NiteRiderA(R) Solas(TM) 250 uses two powerful LEDs to produce an amazing 250 lumens of light output. It features 4 modes (2 flash / 2 steady) and is USB rechargeable. We&';ve implemented what we call "Group Ride Mode" for cyclists who want to stay visible but not distract others in the pack. 2 flashing and 2 steady modes; Group Ride mode is ideal for cyclists who want to stay visible but not distract others in the packEasy on/off seatpost strap mount with quick-release tabFL1 Standard IP64 rated to resist water and dustWeight: 2.9 oz.Charge Time and Battery Life:Charge Time: 4 hoursHigh: 7.5 hoursLow: 40 hoursFlashing: 4 hrs. 30 min. to 6 hrs. 30 min.
