Fingertip Pulse Oximeter is a portable non-invasive, spot-check, oxygen saturation of arterial hemoglobin (SpO2) and pulse rate of adult and pediatric patient at home,and hospital (including clinical use in internist/surgery, Anesthesia, intensive care etc).It is not for continuously monitoring. Two Color OLED Display, four display modes. 4-Direction Display adjustable. Low voltage indicator, Real-time spot-checks. Low power consumption,50 hours continuous to work. Low Perfusion ≤0.4%. Automatic power off when no signal. Small and light weight, convenient to carry.