Instructions: 1. Insert two batteries according to the positive and negative signs in the battery compartment and close the battery cover. 2. Insert your finger into the rubber channel (finger fully extended) and release the clip 3. Click the switch button on the front panel 4. Don't shake your fingers and the human body should not be in motion during use. 5. Read relevant data directly from the display, which can show blood oxygen saturation, pulse rate and pulse amplitude, PI perfusion index 6, only for children over 4 years old and adults. 7. The tested person's fingers should be clean, and nails should not be applied with cosmetics such as nail polish
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