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Note:
To monitor heart rate more accurately, wear the watch on the
upper position of your wrist and a bit tighter than usual when
you exercise. In addition, complete your profile in the app.
4. Measuring Blood Oxygen Level
Before measuring, wear the watch a finger-width below the wrist
bone and a bit tighter than usual.
1) Tap "Blood Oxygen" to enter the blood oxygen level detection
mode.
2) When measuring, keep your arm flush with your chest and the
watch screen facing up. Keep your arm still to ensure the
accuracy of the data.
Sleep Detection Mode: If you want the watch to track your
blood oxygen level during sleep, please open the Letsfit app,
go to the "Settings" page → "IW1", and turn on the blood
oxygen measurement switch. The blood oxygen data will then
be displayed in the app (Go to the "Activity" page → "Sleep
Schedule").
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