Features for Fingertip Pulse Oximeter- 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.