Medical Electric Suction Apparatus 1.Vacuum Pump without oil 2. quikly suck out thick phlegm 3. adjustable vacuum degree FEATURES: 1,Electric portable absorb ... It according to type and degree classification of the protection electric shock,it is the Class I equipments B type application ... ,Relative humidity:≤80%(25°C),Atmospheric pressure:86KPa~106KPa. Medical Electric Suction Apparatus(YB-DX-98-7)