Measures 78" x 34" x 2(1/2)" inflated. 130 bubble cells (meets Medicare Guidelines). 2.5 Alternation Pressure Relief system specifically designed for therapy Treatment of pressure sores stage l, II, prevention. Control knob: adjust comfort range in 8 levels. Pressure range 30-80, cycle time 8 min/60Hz, 9.6 min/50Hz. Patented air compressor chamber with ultra-quiet operation. External Air Filter Intake, securing straps on the mattress.