Yeah it looks like an older 150 - instead of the UP and DOWN buttons to set Time, Cook Temperature, or Holding Temperature you set them with the knob.
The SM150 (this might have been called a 105 I think) is a real workhorse. 5 shelves that are 18 x 18 inches, don't have to cut up slabs of ribs or a brisket to fit it in, it uses 110 (at 15 amps) and like all the other commercial Cookshack models (like ALL the Cookshacks period) it's a real tank.