Sell Fingertip Pulse Oximeter DWD-2704

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The device can accurately measure SpO2 and pulse rate in a 2% tolerance.
The device will power off automatically without the signal for 4 seconds.
Two AAA size batteries are required for operating, and the continuous working time is 12 hours.
When Low-Voltage Warning is shown on screen and the malfunction may be caused.
The device is so light that its weight with batteries is about 50g.
It can show the pulse rate wave of patients.
And the LED light is colorized.