The hand unit features a built-in RF module and supports wireless communication with the DJI Focus Pro Motor from up to 160 meters away. It supports FIZ control over the focus, aperture, and zoom, and features real-time, stepless damping adjustment to balance comfort and precision. The hand unit utilizes the NP-F550 battery model commonly available on the market. The dimensions should be 71×38.6×21.1 mm (L×W×H). Make sure to purchase batteries according to these specified dimensions. Compatibility: DJI Focus Pro Motor, DJI Ronin 4D*, DJI Inspire 3*. * Requires the DJI High-Bright Remote Monitor.