The Lumix AG-YAGHY Interface Unit for GH4 from Panasonic is designed to give the Lumix DMC-GH4 camera the video, audio, and power connectivity required for professional video workflows. When attached to the GH4, the Interface Unit has 2 monaural XLR inputs for line or condenser microphones, and gives you independent volume control of the left and right channels. There is also an audio level display monitor and +48V of phantom power for each channel.