NiteRider: The NiteRider® Solas™ 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.• Daylight Visible Flash (DVF)• 250 lumen super bright tail light• Group Ride Mode – be seen without distracting fellow cyclists• Easy on and off seat post strap mount with quick release tab• Convenient USB rechargeable• Super bright daytime flash mode• Be Seen by cars = Be Safe• FL1 Standard IP64, dust and water-resistantLumen Output: 250Run Time: 4:30 – 40:00hrsCharge Time: 4:00hrsWeight: 82gBattery: Li-PoWARRANTYThe Solas™ 250 is backed by NiteRider’s lifetime warranty that covers any defects in material and workmanship, mechanical components (housings, covers, mounts and fasteners) and LEDs.SYSTEM INCLUDESLED Tail LightSeat Post MountUSB Charging Cable