Knog Plus Rear Light. A 20 lumens rear LED light with five different light modes, that’s USB rechargeable, and multiple mounting options Rechargeable. Knog’s Plus Rear Light is the ideal commuter light with a convenient design. Instead of having to constantly change the light’s batteries the light is completely rechargeable. You can quickly recharge the light via any standard USB port and the light has a battery life of up to 40 hours Light Modes. The light comes with five different light modes ranging from strobing to steady which can easily be toggled between to provide the best lighting for your current environment. The light modes included are:Steady: 2 hoursStrobe: 8.5 hoursPulse: 4.5 hoursFancy Flash: 10 hoursEco Flash: 40 hoursMounting. Multiple mounting options are included with 2 interchangeable straps included for posts 22-27mm and 32mm+ which means the light can be attached to any form of bike frame. A magnetic mount also allows you to wear the light attaching it to your jacket, rucksacks, pannier, etc Features. 20 lumens maximum light output5 different light modesMagnetic mounting systemUSB rechargeableWater resistant designWearableWeighs 12gDimensions: 14 x 66 x 18mmBuy Knog Lights from Chain Reaction Cycles, the World’s Largest Online Bike Store.