Designed for arm chairs and wheelchairs giving the assistance needed to raise or lower to or from a seated position. Hydro-pneumatic lift actuator lifts up to 80 percent of body weight 10in high. Six different weight adjustments to choose from. No wires motors latches or switches required. Soft high density foam with removable easy to clean seat cover. Size 18in x 17in. Weighs only 8 lbs. Weight capacity 200 to 350 lbs.