Citizen YF30 - Adjustment of the Time and Calendar; Acceleration Sensor and Optical Sensor; Settings on the Watch Body

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BLOOD OXYGEN TRACKING
Wear your watch slightly higher up your arm and avoid pressing your watch against your wrist
bone. Make sure your watch ts comfortably on your wrist. Wearing your watch too tight
constricts the blood circulation while wearing it too loose may let other light in, which aects
the measurement. Place your hand on a at surface with your ngers resting open. The back of
your watch should be in contact with your skin. Stay still and avoid interacting with the watch
during the measurement.