Westar OS III Oral Surgery Patient Chair Electromechanical cantilever system. All-metal construction with HiGlos powdercoat inside and out. Thermal overload protection. Double-articulating headrest with lock down for surgery feature adjustable for height and wheelchair positioning. Foot Control with two programmable preset positions and automatic exit (return), 7 function. Left/Right I.V. arms with one interchangeable pillow. Synchronized seat and back tilt. Quick change upholstery. Upholstered arms. Floor to Seat: 13"Min. to 31" Max. Lifetime bushings throughout all pivot points. Five year warranty.