... therapy system is designed for those with superficial established pressure sore or with existing tissue damaged, or assessed ... : ISO9001/ISO13485 , SGS certificate,3.Specification: Anti Decubitus Mattress Alternating Pressure Mattress Nylon + PVC 4Technical Parameters:ModelLP-250Voltage and Frequency:220V/50HzPressure ... weight:100KgCycle period:1/5min(1/6min) Alternating pressure-Air mattress system