Electric Adjustable Standing Desk with Programmable Memory delivers all the quality and features you need to enjoy a healthier, more productive workday. This two-tier model Includes our clamp-on adjustable height desk shelf, which raises monitors to comfortable, ergonomic viewing height and creates a more usable workspace. The programmable electric keypad recalls your favorite sitting and standing settings with a single push of a button, while 3-stage telescoping legs offer an extended adjustment range over competitors' models, which better accommodates taller and shorter users. Comes with both a set of furniture feet, as well as lockable casters to provide mobility and increase the overall height by 2".