The CatEye Nano Shot Plus is a USB rechargeable headlight which gives off 600 lumens of light and offers 3 different modes: High, Low and Hyper Constant (flashing). Ideal for urban commuting, the Hyper-Constant mode puts light on the low setting while flashing on high, so as to be visible by motorists while cycling. There is also an optional helmet mount which serves as a great trail riding light. In high mode, it runs for 1.5 hrs while in low mode, 4 hrs. Hyper-Constant mode offers up to 2 hrs. of running time.