Chief Large Fusion Dynamic Height Adjustable Mobile Cart15. 75 (400 mm), 200 x 200 800 x 400 mm Ideal for interactive applications, Fusion mounts with dynamic height adjust capability create better accessibility to technology in the boardroom and the classroom. The height adjustable box provides ultra smooth and fast vertical travel with almost no effort. Easy to install. Easy to adjust. Round edges and sleek features give the cart a softer, professional feel that fits in well in corporate and classroom