The Power Drive Grip II (WG401) automatically cocks the leaf shutter lenes and permits remote control. It is ergonomically designed for simple, right hand camera operation. The WG401 features manual film advance crank, multiple exposure switch, cable release socket, battery check and continuous shooting. It is compatible with leaf shutter lenses. Six AA batteries are required for operation. This drive is compatible with Mamiya 645 Super, PRO and PRO TL models.