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Red coloured words for more comfortable readings:Large LED display. Easy to read results indoor and outdoors Can measure SpO2 and Pulse Rate accurately. SpO2 and Pulse Rate display,bar graph display Automatically detect finger position, automatically shut down after 5 seconds without finger, energy saving Q1:We can't turn on the oximeter,even the batteries are new. Answered:The positive and negative poles of the battery are marked at the location where the battery is installed.The two springs are on the same side, the two batteries are still need to be installed in opposite directions.If this does not work,please kindly contact the manufacturer directly.We are the direct manufacturer,CONTEC.We can offer a satisfied solution.We can re send or refund. Q2:For any condition,please just contact the seller directly through amazon.You'll get a satisfied solution in any time. Can monitor your SPO2 heart rate in every time,everywhere.It is suitable in plateau area, community healthcare, oxygen bar, Fitness clubs, physical training room and family, etc. People who interested in measuring their SpO2 and pulse rate.Such as skiers, bikers,climbers and so on. We recommend to test your blood oxygen levels after doing sports. plasticStatements regarding dietary supplements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease or health condition. To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzed reviews to verify trustworthiness.







