This Nucleus M Left Hand Grip allows you to control your Nucleus M and Nucleus Nano wireless focus motors.The left hand grip can control a single motor assigned by the AC Finger Knob. Individual motor torque can be changed from the handles menu.Remote start/stop is possible by plugging a compatible Nucleus-M R/S cable into the open 7-pin port of a motor. This then gives you R/S capabilities through the Hand Grips REC button.A-B stops can be created for the Finger Knob and the throw can be adjusted for shorter or longer throws.Powered by (2) 18650 Batteries NOT included. Handle can be powered by the 7-pin port by the camera.