oxygen facial machine 1.98% pure oxygen 2.wrinkle and pigment remove 3.whiten, peeling,firming skin 4.CE, OEM microdermabrasion machine Working principle:Introducing world's most advanced PSA technology (transformer adsorption principle), this machine can instantly and continuously separate the high-concentrated, clean, sterile medical oxygen from the air. The purity of oxygen can reach to 98%. ...