Non-powered mattress overlay requires no external power source. Zoned: 3 sections each 27 X 35 inches. Adjustable: 6-1/2 X 6-1/2 X 3-1/2 inch air cells adjust to the shape and contour of the body. Durable polyvinyl material can be cleaned with soap and water. Hand inflation pump included. 300 pound weight limit. This product is required to be reported under California Proposition 65.