This is an Uplift Desk desktop converter. It has a 17" lift from the desktop to the top of the converter (see photos). It comes with a keyboard tray that can be seen in the photos as well. It's 29" wide (usable) and just under 19" deep (usable). It is a manual lift mechanism (see video).
If you are wanting to start standing at your desk or at least have the option to stand, this is a great way to do so without the expense of buying a brand new desk. It can be placed on any desk top and used immediately. Great for any office.