Features for Fingertip Pulse Oximeter: - Measure SpO2 and PR accurately- Color OLED display SpO2 and PR， Pulse waveform and bargraph display- High brightness full color OLED can be used even in dark night- Four viewing angles and six display modes- Four levels adjustable brightness- Low battery voltage indicator- Automatic power off when signal is not available for 4 seconds- 2 AAA batteries support 30 hours continuously- Mini size， light weight， convenient to carry- Widely used in hospital， home healthcare， oxygen bar， community medical centre， alpine area， sports healthcare etc.