Flexipsot adjustable standing or sitting desk. Sits at the top of the desk and can be elevated or lower to your choice. Has a hydraulic damper for smooth running. Lift and lower desk with a lever down to the top (see picture). Adjust from 6 "to 18." Measures 35 "long and 23" deep. Perfect for your home office. It's perfect condition. Charged $250, sold for $140. Please call me or email me if interested.