The mixer has 16 mic channels with Midas preamps and one stereo line-in channel. USB connection to a PC or Mac allows recording of 20 channels, which include the LR mix.
There are no mechanical faders, The mixer is operated with a tablet, a PC or Mac, or a smartphone. An iPad is shown,
The above slideshow has views of the Behringer X18 mixer and the XR18, which is designed as a compact stage box.
The XR18 has adapter plates for rack mounting. The X18 is for desktop use.
One slide shows the PC interface screen. A detailed video is below.