Finger Tip Pulse OximeterFDA Approved2 years GuaranteeTough exteriorHigh accuracy Perfusion index (PI) Low battery indicatorAutomatic Power off PR waveform display Four way display screen OLED display Break ResistantProgramable settings of AlarmsCE 0123 Certified RoHS complaintTough exteriorHigh accuracyPI indexLow battery indicatorAutomatic Power offPR waveform displayFour way display screenOLED displayBreak Resistant..