QDC-501 is designed for the treatment and prevention of pressure sore stageⅠ and Ⅱ in long-term and domiciliary therapies. The alternating mattress system consists an 11 cm-high mattress with 18 Nylon+PVC interchangeable cells working in LTERNATING mode. Low air loss holes provide good ventilation and keep the users dry from unwanted humidity building-up between the body and the mattress. The pump operates at very low sound level and is easy to use. The pump can be hung to the end frame thanks to an easy clip-on hanger.