Please ensure that the sensor area is placed against the wrist.
If the heart rate cannot be detected →
Tighten the band a little during exercise, but it is ok to loosen it a little during sleep or at rest.
When fastening the band, make sure both bands are flat against your wrist.
Worn correctly
Inner band is flat against the wrist
Worn incorrectly
Inner band is folded between the outer belt and buckle