Alternating Pressure Relief Bubble Pad System

2.5” alternating pressure relief system specifically designed for the treatment of pressure sores stage l and II, and for prevention. Control knob: adjust comfort range in 8 levels. Pressure range 30-80, cycle time 8 min/60Hz, 9.6 min/50Hz. Features patented air compressor chamber with ultra-quiet operation, external air filter intake, and securing straps on the mattress. Weight capacity: 220lbs.