Ergotron’s patented 400 Series Arms allow users to lift, swing, and tilt flat panel monitors, laptops, and keyboards for maximum efficiency. With up to 24" of vertical adjustability, Ergotron’s broadest height range, you can easily adjust from a standing to a sitting position or anywhere in between.400 Arms are extremely stable throughout their entire range of motion. 400 Series Arms also allow you to move components out of the way when not in use, which is an essential feature in areas where space is at a premium.