This unit is a self-closing version of the PW-54E. You still have the large stainless steel base and projected window, without the high cost of an electric window. The inside counter space is a generous 53-1/2” (w) x 16” (d). The BPSC-5440 is a great unit for businesses that want to display product in their drive-thru without hampering the service they give to their customers. Doors lock automatically when closed.