Olympus made 4 different power winders. The Winder 1 is a motor drive that will advance the film automatically after each picture and will recheck the shutter taking approximately .3s. Sequential shooting is not possible. The Winder 2, which I have, is an upgrade of the Winder 1 which will automatically advance the film a frame and recheck the shutter, in about the same time as the winder 1 (.3s), but it also allows sequential shooting of up to 2.5 frames per second. Both winders take 4 AA batteries and have a neat feature where the motor drive cover from the camera can be stored in the battery compartment so it won’t be lost.