The Roceloc Electric Desk Riser bundle provides effortless functionality in a standing desk converter, with smooth quiet up/down motion at the touch of a button. Features a large 46 x 23.6 work surface, plus a full size 35 x 10 fixed keyboard tray that holds a keyboard or laptop. Electric lift system raises up to 35 lbs, with Enhanced Vertical Range from 4.7 to 21.7 allowing comfortable ergonomics for users of all heights. Useful extras include 4 AC outlets + 2 USB 2.0 ports on the desktop, a 10.5 wide slot on the main work surface to hold a tablet or phone, and a rear grommet hole for an optional monitor arm. Included Anti-Fatigue Mat will help support your back, hips, knees and feet so you can get all the benefits of standing while you work. This versatile desk mat effectively ?reduces your weight by 30% to make standing easier on your feet and joints. The advanced multi-layer construction offers a comfortable ?leather like top surface, a memory foam inner layer and a non-slip bottom. A perfect 30 x 20 size provides plenty of room to move around, but still can fit into the kneehole of a standard desk or built-in when it is not being used. Beveled edges help to reduce tripping issues and ? commercial grade thickness provides hours of comfort and stability. The durable materials on this desk mat will not break down, even after years of use.