The Med Aire Alternating Pressure Pump and Pad System with Low Air Loss by Drive Medical provides 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 overlay pad comes with two end flaps, ensuring that it remains secure on the mattress. The variable pressure, 4 LPM (liters per minute) pump produces a consistent air flow, adjustable pressure, and it's quiet technology alternately inflates and deflates the pads air cells.