Drive Medical's Med Aire Alternating Pressure Pump and Pad System with low air loss provides while alternating pressure and is designed to be used in the prevention, treatment and management of pressure ulcers. The bubble pad provides superior therapeutic treatment alternating which of the 130 individual bubble cells are inflated or deflated every 5 minutes, never placing too much pressure on any affected area. The variable pressure 4 LPM (liters per minute) pump produces a consistent airflow, adjustable pressure, and its quiet technology alternately inflates and deflates the pad's air cells.