Allows the user to transition from seating position to standing position throughout the workday. Designed to sit atop existing desk and create sit-to-stand functionality by raising the computer. Gas-assist lever-operated height adjustment mechanism is easy to use and accurate. Easily mounts with a clamp to any worksurface with a depth of 20" - 30". Seamless black worksurface looks good with any type or color of desk. Includes a large primary worksurface and a smaller platform for keyboard and mouse. Beveled edges create a sleek look and add comfort when typing. Mounting surface not included.