Air Lift Technology from Doctors Recommendation: All the 130 cells of this medical pressure mattress inflate and deflate alternately, creating 3 air circulation modes under the mattress. The pump is very quiet and provides adjustable pressure. Thispressure mattress can greatly alleviate bed sores and pressure spots. 3 Modes Hospital Mattress: The pressure pump generates different airflow inside the medical mattress - the cells inflate and deflate automatically, making 3 alternating modes. Each air circle is about 6-7 minutes. The variable pressure pad can distributepatients body weight, alleviate bed sores and promote blood circulation. Quiet Pump with Customizable Pressure: The sound of the working pump is less than 50dB, just like a whisper, providing a sound sleep for patients with painful pressure sores. In addition, the adjustable pressure button offers multiple levels of airpressure, meeting the demands of patients with different weights and needs. Premium Mattress with Medical Material: The bed sore mattress is made of high quality PVC material and its extended part can prevent sliding when tucked under the existing mattress. The mattress is waterproof and easy-cleaning. It can effectively protectthe skin health of the patient.