The SV Power Drive Grip WG402 attaches quickly and simply to the Mamiya 645 Pro TL or Pro camera body, and with the touch of a single button, activates the light meter, releases the shutter, re-cocks the shutter, and advances the film to the next frame, ready for action.The operation is smooth and quiet with locking, single-frame operation release button. Continuous firing at approximately 1 frame per second is possible using camera body shutter release button.