Leica Motor Winder R for R4, R4S, RE, R5, R6, R6-2 Cameras, can be operated by the cameras shutter release button or by the button on the front of the winder, it will also take a later type Handgrip R with an electrical release button, runs on six 'AA' sized batteries, in clean condition, has a few rub marks on the base of the winder.