RSD5300 Fingertip Pulse Oximeter Details：   Features:                                                         1.Reliable accuracy and durability 2.Two Color OLED Display, four display modes. 3.4-Direction Display adjustable. 4.Low voltage indicator, Real-time spot-checks. 5.Can measure SPO2,PR accurately. 6.SPO2 and PR display,PR waveform and bargraph display 7.Battery voltage low indication. 8.Low power consumption; Automatic power off when no signal   Low power consumption,20 hours continuous to work.   Low Perfusion less than 0.4% 9.Pulse sound function 10.Alarm function 11.Small and light weight, convenient to carry   Parameters:                                                      1.4 direction colour OLED display,resolution 96*64 2.SPO2:36%-99% 3.Pulse Ratio:30-250BPM 4.Resolution:1% for SPO2,1BPM for pulse ratio 5.Accuracy:2%(70%-99%)                 unspecified(<70%) for SPO2                 2BPM or 2%(select larger) for pulse ratio 6.Power by :1.5V AAA battery    7.Can work more than 20hours continuously 8.Resistance capacity against ambient light and measurement perfermance at low perfusion 9.Auto power-off function,four directions,eight modes.   Packing:                                                            1.main unit 2.user manual