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ACCURATE & RELIABLE: Blood oxygen accuracy is ±2%, pulse rate is ±1%, SpO2 measurement range is 70% to 99%, PI measurement range is 0.2%-30%, (PR)BPM measurement range is 30 bpm - 250 bpm . FDA and CE certification.QUICK & CONVENIENT READINGS: Our precision two-color oximeter displays SpO2 in four directions, six display modes. The bright OLED screen prevents ambient light from escaping, making the readings clear, with 5 levels of brightness adjustable, and a low-power indicator.4-in-1 FUNCTION: Our SPO2 sensor will check and display blood oxygen SPO2 value, pulse PR value, blood oxygen bar graph, pulse waveform graph, PI (perfusion index), respiratory rate monitoring parameter in real time.PORTABLE & LIGHTWEIGHT: Each oximeter weighs only 3 oz. and comes with a neck lanyard, attaches the lanyard to the case(not included) or connects directly to the oximeter, so you can use the portable oxygen sensor at any time.SUITABLE For EVERYONE: sports enthusiasts such as climbers, skiers, cyclists, runners, aviation use or anyone interested in measuring their SpO2 and pulse rate, recording breathing or sleeping.2 regular AAA batteries (not rechargeable ones) required. ( Due to aerial restriction, batteries are not included in this package!)The whole package includes: 1 Finger Pulse Oximeter; 1 Lanyard; 1 English user's manual; 1 box Color: Black with gold; Black with silver. Please let me know your color preference, or I'll randomly pick! Our oximeters are really FDA & CE approved, please click this FDA's link: https://www.accessdata.fda.gov/cdrh_docs/pdf16/K163135.pdf 4 parameters: SpO2; PR; PI; RR You're welcome to ask for our competitive wholesale price!