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Dual color oled screen displays waveform and pulsebar6 display modes with adjustable brightnessBattery low indicator and automatic power-off function2AAA alkaline batteries required for operationSuitable for both adult and children and 2 year replacement warranty from the date of purchase..

A device for measuring the percentage of oxygen saturation in the blood for adults by means of a finger Heart rate measurementHigh efficiency small size Stylish designBattery type 2*AAA..