8 pressurization modes which can combine for different treatment protocol. 12 overlapping chambers, avoid blind angle and reverse blood flow. Individual pressure for each chamber to avoid pressing the wound by setting zero pressure, inflation time and interval time of each chamber can be controlled. Gradient Pressure range: 0 ~ 200mmHg, safety to valve in vein. FDA, SFDA, CE, UL, GMP, ISO9001, ISO13485 certified.