Drive Medical Med Aire Alternating Pressure Pump and Pad System with Variable PressureExperience enhanced comfort and pressure relief with the Drive Medical Med Aire Alternating Pressure Pump and Pad System an essential solution for preventing and treating pressure ulcers in individuals who are bedridden or have limited mobility. Key Features: Alternating Pressure Design Reduces pressure points by alternating air flow in 4 minute cycles. Variable Pressure Settings Easily adjust firmness to meet individual comfort needs. Quiet Pump