Use the Ronin-MX/S RSS Control Cable for Panasonic to connect your Panasonic GH3 or GH4 & the Ronin-S Camera Control Port to control your camera. Please refer to the Ronin-S Camera Compatibility List for more information on supported camera models, control features, & camera settings. It is also used to connect the Ronin-MX Remote Start/ Stop Camera Port to Panasonic cameras.