Sell fingertip pulse oximeter BM-602

Features:
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 60g.