Function at back: Four different kinds of massage modes: knead, shiatsu, knock and knead-knock at the same time Six wheels driven at back which will be traveled up & down to massage your neck, shoulder, back and waist to keep relaxed. Airbags are set at the cushion and calf which will make your body more relax The back can be laid down at the angle of 170 degree while the calf can be lift at the angle of 90 degree Auto timing functions for 5. 15 and 25mins All the functions is controlled by the microcomputer Equipped the swivel wheels which can be flexible to remove the chair One carton for package: 115*80*76cm GW: 90KG NW: 78KG Power Supply: 110-120V or 220-240V, 50-60HZ, 180W