Engle Chairs have a thin back with lumbar support with an anatomically correct back pivot point, touch pad, synchronized back and toe board recline, smooth, quiet all hydraulic system, 60° seat rotation without 360 Lt/Rt light del., 30° seat rotation with 360 Lt/Rt Light Del., vinyl contour upholstery, quick release double articulating headrest, left/right swing down upholstered arms, programmable exit and 10 year electronic system limited warranty.