Adjustable workstation can be set up for multiple configurations and heights. Main desktop has (2) slide-out trays for a mouse, arm rest, etc. There are (3) swing-out shelves for items like a computer tower, laptop, phone, modem/router, storage. Main desk is 29” x 43”, monitor shelf is 14” x 43”, top shelf is 18” x 43”. (2) swing out shelves are 16” x 16”, (1) is 12” x 12”. Swing out shelves add to the 46” width. Photo shows felt moving pads under the frame and are not included.