Feature: Can be used in hospital ，home，community medical treatment，sports healthcare，ect.Can measure SPO2，PR accurately.SPO2 and PR display，PR waveform and bargraph displayBattery voltage low indication.Four directions and eight modesLow power consumption;shut off automatically when no signalPulse sound functionAlarm function Technical parameters:1.3' 65 colour OLED display，resolution 96*64SPO2:35%-99%Pulse Ratio:30-250BPMResolution:1% for SPO2，1BPM for pulse ratioAccuracy:+-2%(70%-99%) unspecified(<70%) for SPO2 +-2BPM or+- 2%(select larger) for pulse ratiopower:1.5V(AAA size) Alkaline batteries*2can work more than 30 hours continuouslyinterference resistance capacity against ambient light and measurement perfermance at low perfusionPackage including:1* Pulse oximeter1* User manual1* String1* Giftbox