Upgrade your MagNum system to control your lens zoom with this Zoom Rocker upgrade from Chrosziel. The rocker can be installed on 2-channel manual units (MN-200T) and 1-channel expandable units (MN-150T) manufactured in 2015 or earlier. This low-profile rocker conveniently installs on the back of the manual unit, where your fingers naturally rest. The rocker can be used traditionally with two fingers, or by using the extended bar in the centre, with one finger. With your thumb remaining free, all 3 axes can be adjusted comfortably and, if necessary, simultaneously. The installation process requires no wiring, as the rocker communicates via wireless transmission. This design keeps the manual unit dust and moisture resistant. An activation code is included to enable the rocker function in the manual unit.