Please ensure your bracelet’s battery is not empty. You can check the device is correctly powered by shaking the bracelet or double tap it on the side. A green light should light up. If this is not the case, please put it on the charger.
You can also check the following FAQ to help you understand why you may have missing measurements: I have gaps in my daily measurements / How can I get more readings?
If none of the above resolved your issue, please contact us at firstname.lastname@example.org