The Controller is designed for constant use, in particular for 24/7 shift work, even for people weighing up to 200 kg. The seat and backrest of Controller are generously dimensioned and particularly designed for heavy duty, while the adjustment controls are user-friendly and very long-lasting. The Controller offers a large opening angle and smooth motion of the body. This in turn enables relaxed working conditions, even when the person leans far back in the chair. Comfortable neck and head supports together with universally adjustable armrests complete the extensive comfort characteristics of the chair.