Supplied with 4pc CR2032 batteries. Bright and attractive light looks great on your shoes. Product material: ABS+LED 2 LED's 0.75 lumens, light mode on/flash/off. Light weight, you don't feel tired 1 piece shoe heel clip lights ideal when out running, cycling, horse riding etc. Attach to ankle with simple wrap round design and hook and loop fastening. Trainer Clip For Runners And Cyclists | Living Social | Living Social