Push open the battery cover, insert two batteries into the compartment, then close the battery cover tightly
01
02
Insert your finger into the silicone finger sleeve with the nail facing up (it is best to insert your finger completely)
03
Press the switch button and wait for 5-8 seconds to display the blood oxygen concentration and pulse rate values
04
If you want to change the display direction during use, press the switch button
There are 2 display directions in total.