It is the analogue Speaker Sim with digital control. Box with 2 buttons Bypass & mode. There are 9 variants CAB: 2-4x10, 8x10, 4x12, 1x15, 2-2x15, 4x15, 1x18. By pressing the MODE you successively switch between preset variants, the display shows its names. No knobs, strictly set parameters of frequency characteristics of cabinet and dynamics. One input and two outs: 6,3" unbalanced jack and balanced XLR DI Out.
Other names: basscabinet simulator, basscabinetsimulator