Cateye loop 2 front light rechargeablecateyes loop 2 rc is a lightweight front light that is sleek and compact with eye catching visibility it only requires 15hrs of charge time for 15hrs of flashing and 4hrs of constant runtime this rechargeable light is easy to install on bars with a diameter of between 22mm 32mm featuresdimensions 28mm x 28mm x 27mmlight source white led x1battery lithium ion rechargeable battery 80marecharge time approx 3hrs usb2 0runtime flashing approx 15