Use inside or outside the home on most armchairs and sofas. The standing aid is portable so you can also take it on the go. for use in wheelchairs, automobiles, reclining chairs or office chairs with non-lockable wheels. A lift assistance device for elderly, handicap, or disabled that is also self-powered. The hydro-pneumatic gas spring in the chair lift releases slowly as the user begins to stand, no batteries needed. If you have any questions about the product, please contact us in time, we will reply you within 24 hours. The lift seat is very comfortable. The 100% polyester cover is machine washable & the polyurethane foam cushion is easy to care for. Perfect for those with low body strength, Arthritis, Parkinson's Muscular Dystrophy, or Handicap. Height-adjustable seat cushions with hand controls, allowing adjustment of position and height, providing comfort and flexibility whether sitting or standing