With the Hi‑5 hand unit, ARRI introduced the fifth generation of its Electronic Control System (ECS). Now, the ZMU‑4 joins that ecosystem, sharing the Hi‑5’s swappable RF-EMIP, RF-2400, and RF-900 radio modules (coming soon), with different frequencies for different territories and shooting situations. Whichever radio module is chosen, it fits neatly into a recessed slot in the ZMU‑4 and becomes integral to the slimline form factor. There are no external radio boxes and no additional cables or setting up—just unplug from the camera and go.
