The loop 2 rc is born from the same sleek compact design and eye catching visibility asthe loop 2 but is now rechargeablewith just 15 hours of charge time you get 15 hours flashing and 4 hours constant runtime on the front light and 10 hours flashing 25 hours constant run time on the rearlight installs easily on all 22 32mm diameter bars get noticed with the loop 2 series ofcateye lights tech specs dimensions 28 x 28 x 27 mm weight 18 grams light unit and battery light