Height Adjustable Sit Stand Desk, Anti-Fatigue Mat Included, 36" Surface, Included One Anti-Fatigue Mat,with Smartphone and Tablet Holder FREE ANTI-FATIGUE MAT included with every purchase ($40 value). 32 x 20 inches to reduce fatigue while standing LARGE 36" WIDE TOP SURFACE easily fits two monitors or a laptop and monitor with enough room for pens, paper, coffee cup, etc The height is adjustable from 6 inches to 16 inches, you can choose from 8 levels between sitting and standing. GAS SPRING ARM allows easy movement and adjustability between multiple locking positions, even with 35 lbs of weight loaded SMARTPHONE/TABLET SLOT helps keep all your devices at an easy viewing angle and within arms reach at all times