Small volume(57(L)× 31(W)×32(H)mm)、light, convenient to carry Display Mode:0.96" double Color OLED display,Screen Resolution:128*64 SpO2 Measuring Range:O~100% PR Measuring Range:30~250bpm Resolution: 1% for Spo2,1bpm for pulse rate Accuracy:土2%(70%~100%), unspecified(<70%) for Spo2,士2bpm or+ 2%(select larger) for pulse rate