WHAT IS ALTERNATING PRESSURE: Alternating pressure therapy uses pressure redistribution to relieve pressure on skin surfaces and bony prominences. The air cells on the mattress slowly inflate and deflate under the user at a predetermined or adjustable cycle time. INTENDED FOR: The MA500 alternating pressure system is intended for individuals from low-medium risk of pressure sores or stages I-III. SAFETY: Cell in cell design helps prevent bottoming out in the event of a power failure. THERAPEUTIC TECHNOLOGY: Natural heel slope is designed to decrease pressure in the vulnerable heel area. CLINICAL FEATURES: In a two-cell cycle mattress, alternating function inflates and deflates cells in a 2:1 cycle.