The ARRI ZMU-4 Control Unit controls the zoom function of your cinema camera via wired or wireless connection (see below for compatibility). Combine the ZMU-4 with other LBUS control devices like the OCU-1 and Master Grip handles. Its slim, ambidextrous design makes it easy to attach to your camera rig or hold in your hand.

Choose different radio modules for different regions and shooting situations – the ZMU‑4 supports all the new radio module options available for the Hi‑5 hand unit. Wireless operation is more streamlined than with any other system. The ZMU‑4 can act as a radio module for other LBUS control devices such as the ARRI OCU‑1 or Master Grips, offering the possibility of multi-axis controllers off-camera. Intuitively familiar for traditional tripod setups, the ZMU‑4 is comfortable to use in either hand, allowing precise control via the force-sensitive zoom knob.

Like the Hi-5, the ZMU-4 is compatible with industry standard Sony NP-F550/570 batteries, though it has been designed and optimized to make use of proprietary ARRI LBP-3500 batteries, which offer more consistent power delivery and an unprecedented run time of at least 15 hours with the RF-EMIP radio module. The ARRI batteries also allow the ZMU-4 to display remaining power as a highly accurate percentage , permitting more efficient battery managment than is possible with any other zoom control.

The RF-EMIP Radio Module 2400 MHz DSSS (Direct-Sequence Spread Spectrum) from ARRI is an exchangeable radio module designed for use with the Hi-5 lens control hand unit and the Radio Interface Adapter RIA-1. This module offers point-to-multipoint communication for connecting up to three hand units with one camera.

The ARRI RA-7 adapter can be used in conjunction with the ARRI ZMU-4. It allows the ZMU-4 to be used with a wide range of existing accessories equipped with multi-postion ARRI rosette attachment points, which have been an industry standard for decades. The RA-7 allows the ZMU-4 to be attached to the rosette mount on any camera, hand grip, or bridge plate, and the two Handgrip Pan Bar Adapters and Pan Bar Clamp Universal are ideal companions for tripod mounting.

The ARRI RA-8 adapter can be used in conjunction with the ARRI ZMU-4. It allows the ZMU-4 to be used with a wide range of existing accessories equipped with multi-postion ARRI rosette attachment points, which have been an industry standard for decades. The RA-8 permits the ZMU-4 and Operator Control Unit OCU-1 to be combined into a compact and versatile single unit that can be monitor-mounted or handlheld.

The LBP-3500 Battery is a 7.4V, 3500mAh battery used to power the ARRI Hi-5 wireless controller hand unit. Unlike third-party Sony L-Series batteries, this rechargeable battery displays its remaining charge in 1% increments on your hand unit.