Features: - Reliable accuracy and durability - 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 - Widely used in hospital, home healthcare, oxygen bar, community medical centre, alpine area, sports healthcare etc.