Dear，Pls leave a massage to tell us what design (Color) do you want.thank you.

A pulse oximeter is a medical device that indirectly measures the oxygen saturation of a patients blood (as opposed to measuring oxygen saturation directly through a blood sample) and changes in blood volume in the skin， producing a photoplethysmograph. It is often attached to a medical monitor so staff can see a patients oxygenation at all times.