Cell Type Anti Decubitus Mattress Rossmax AM40 Cell mattress 2 to 1 alternating therapy Adjustable hangers for most bed types Comfortable Nylon mattress High quality pump Weight indicator pressure adjustment setting 12 minutes cycling time Near silent low noise For treatment of patients at medium to high risk of pressure ulcers 2 to 1 alternating therapy Rossmax Air Mattress range is available in two versions - bubble type and cell type. With this complete assortment we offer solutions for all four "Pressure Ulcer Classification" Stage 1 - 4. Whereas the bubble-type is recommended for stage 1 and 2, the cell-type is suggested for stage 2 - 4. The 2 to 1 alternating inflation method is inflating ½ of the cells and deflating the other ½. Accessories: Instruction Manual Pump High Quality Rubber Tube Fuse Spare Cell