The JVC HZ-HM150VZR Remote Lens Control For GY-HM150U Camcorder is a great tool when operating your camcorder using a tripod, jib, crane or boom. It plugs into the 3.5mm remote connector on the right side of the GY-HM150U. When used on a jib, crane or boom, the device requires a 3.5mm extension cable (not included). The HZ-HM150VZR conveniently enables access to and control of all remote functions with a single hand. Zoom operation is enabled via a wide sweep variable rocker control. Focus is located on the right side, via a rocker style control for manual operation. Iris control is made possible via 2 separate controls, which allow you to either increase or decrease the lens iris. On the top right, you will find the "R" button, enabling manual control over the record start / stop function.