Cateye loop 2 front rear set rechargeablecateyes loop 2 rc front and rear light set is sleek and compact with eye catching visibility each light only requires 15hrs of charge time which will provide the front light with 15hrs of flashing and 4hrs of constant runtime while the rear light will run for 10hrs on flashing and 25hrs on constant these rechargeable lights are easy to install on bars with a diameter of between 22mm 32mm featuresdimensions 28mm x 28mm x 27mmlight source front