Motor Drive Grips are part of the modular design of the 645 Pro body and add to the comfort and speed of operation. Optional Power Drive Grip II (WG401) allows continuous or single frame advance or remote control operation at 1.5 frame per second, without the need to own a second motor-integrated camera body. The Power Drive Grip II can also link with 645 Series leaf shutter lenses via available cable for instant cocking. The SV Power Drive Grip (WG 402) is smaller and lighter than the Power Drive Grip II, but does not cock leaf shutter lenses automatically, and must be removed for multiple exposures.