NiteRider Solas 250 Rear Light. A rear commuter light that’s USB rechargeable and comes with a versatile seat post mount with up to 250 lumens of light output Light Modes. NiteRider’s Solas 250 Rear Light comes with four different light modes which can easily be toggled between using the top power button. The light modes include both constant and flashing modes with a range of light outputs Mode One (Flashing): 6.30 hoursMode Two (Flashing): 4.30 hoursMode Three: 7.30 hoursMode Four: 40 hoursUSB Rechargeable. The light comes with an internal lithium-ion battery which is rechargeable via any standard USB port with a battery light indicator which lets you know when it’s time to charge. The Solas takes 4 hours to fully recharge and has a battery life of up to 40 hours of battery life Mount. Integrated into the design of tail light is a quick release seat post strap with a fully adjustable design with a versatile fit that will work with most bike frames In the Box. LED tail lightSeat post mountUSB charging cableFeatures. 250 lumens maximum light output4 different light modesGroup Ride and Daylight Visible Flash modeUSB rechargeable lithium-polymer batteryBattery light indicatorUp to 40 hours battery lifeFL1 standard IP64 dust and water resistanceWeighs 82gBuy NiteRider Lights from Chain Reaction Cycles, the World’s Largest Online Bike Store.