Features: Integrated with SpO2 probe and processing display module. Can be used in: Hospital, home, community medical treatment, sports healthcare, etc. Can measure SpO2 and PR accurately. SpO2 and PR display, PR waveform and bargraph display. Battery voltage low indication. Four directions and six modes. Four levels adjustable brightness. Low power consumption; Shut off automatically when no signal. Small volume(57(L)x31(W)x32(H)mm), light, convenient to carry. Technical Parameters. 1.3double color OLED display, resolution 160*64 SpO2: 35-99% Pulse Ratio: 30-250BPM Resolution: 1% for SpO2, 1BPM for pulse ratio Accuracy: 2% (70%-99%), unspecified(<70%)for SpO2, 2BPM or 2%(select larger)for pulse ratio Power: 1.5V(AAA size)alkaline batteries x2 Can work more than 30 hours continuously. Interference resistance capacity against ambient light and measurement performance at low perfusion.