This is the office chair that has an integral shiatsu massaging mechanism that rolls up and down the back to penetrate sore muscles and release stress caused by tensions that stack up during a hectic day, all without leaving the office. Simply plug the included AC adapter into any outlet, and use the handheld control to select a pre-programmed 10-, 15-, or 20-minute routine (or any length of program you customize) for a focus on the full upper or lower back. You can engage the vibrating seat for further relaxation and stress relief, the chair operates with an imperceptible hum as it massages, so it won't disturb co-workers. The seat is generously sized at 21" wide and 19" deep and the back is 31" highall covered in supple top-grain leather ; includes a lumbar pillow for fine-tuning the comfort of the back while seated at a desk. The chair is supported by a five-leg chrome base, finished by sturdy nylon casters that provide complete mobility on hard floors and carpets. It has a pneumatic seat height adjustment that provides a seating height range of 17"-20" from the floor and a tilt mechanism. Supports up to 250 lbs. 44" H x 27" W x 27" D. (55 lbs.)