NiteRider Sentinel 250 Rear Light. A 250 lumen light output with a range of light modes with integrated lasers that create your very own virtual bike lane for the ultimate safety when road cycling Lasers. NiteRider’s Sentinel 250 rear light comes with integrated lasers that projects ultra-bright laser lines on the ground creating your own virtual lane Light Modes. The light comes with 7 different light modes which can easily be toggled between using the top power button. The light modes included come with a range of different outputs suitable for a range of environments and terrains with different outputs with flashing, constant and laser modes Mode One (Flashing): 6.30 hoursMode Two (Flashing): 5 hoursMode Three: 8 hoursMode Four: 45 hoursMode Five (Lasers Only): 11 30 hoursMode Six (Lasers Only): 11 30 hoursMode Seven (Lasers Only): 5.30 hoursUSB Rechargeable. The internal lithium-polymer battery is rechargeable and can easily be charged, via the cable provided, by plugging the light into any standard USB port. When powering off the light’s central circle will light up red indicating a low battery so you know when to charge Mounting. To mount the Sentinel to your seat post the light comes with a easy on and off seat post mount with a quick release tab which is super convenient for urban commuters In the Box. LED Sentinel 250 rear light headSeat post mountUSB charging cableFeatures. 250 maximum lumen output7 different light modesDaylight Visible Flash modeGroup Ride modeHighly visible laser linesInternal lithium-polymer batteryUp to 45 hours of battery lifeUSB rechargeable3 hours full recharge timeLow battery light indicatorEasy on and off seat post strap mountQuick release tabFL1 standard IP64 dust and water resistanceWeighs 116gBuy NiteRider Lights from Chain Reaction Cycles, the World’s Largest Online Bike Store.