Electromotive height adjustment and synchronous adjustment of the reclining surface the adjustment range for the electromotive sitting and reclining surface is 30 cm. Adjustment is performed with a separate foot switch, also optionally with an additional control element in the backrest (depending on model). The backrest and leg support are adjusted synchronously to the horizontal using a gas pressure spring. The chair is available optionally as a mobile version. By operating a foot lever the chair is raised and four double castors are extended. The chair can then be easily moved in the treatment room.