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Charge 5 - Led lights

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How many led lights should the charge 5 be using to detect pulse rate. 
I only ever seeing it using one green flashing light?

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Hi @Kiwigrahams  green is for your heart rate and red is for the oxygen saturation.

Stepping in the U.S.A. since September 2013. Android 14

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Thank you very much. 

I have only ever seen the green led not sure when the red is supposed to operate to check O2 levels - maybe when sleeping?

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@Kiwigrahams  this article will explain how it works - click to read

Stepping in the U.S.A. since September 2013. Android 14

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