Delivers leading ergonomics sitting or standing with 17 in of vertical height adjustment, plus 3 in of keyboard adjustment. Keyboard tray can be positioned as low as 3.5 in below desktop. Large work surface (32 x 27 in). Can support from 10 to 40 lbs. Folds down to within 2 inches of your desk. Solid metal design lets you avoid tipping or sway. 5- year warranty. Sold by each.