Height adjustable dual-tier platform sits on top of your current desk and gives you the benefit of standing or sitting on demand. Switching between sitting and standing throughout a long work day provides several health benefits for the body, such as increased blood flow and enhanced posture. Standing throughout the day also keeps the mind alert and productive while working. Product Features: Perfect for laptops, notebooks, and tablets Fits most desks in any office or cube Ergonomic design that adjusts to most user's height Spring-assisted lift mechanism Switches from sitting to standing position in seconds Built-in keyboard tray Holds up to 33 lbs. of weight Easy set-up. Little to no assembly required Specifications: Style: Manual Riser Desktop surface: 35 inches x 23 inches Keyboard Tray : 35 inches x 7.4 inches Display Surface Height: 5.7 inches to 19.6 inches Material: Metal Max Weight Capacity: 33lbs Color: Black Package Includes 1 Computer Stand Up Desk 1 Owners Manual