Nuband FLASH HR 3, User Manual

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2. Ensure the Bluetooth is enabled on your smartphone.
3. When your Nuband Flash HR 3 is charged, re-seat the module
into the strap, place the Nuband on your wrist and fasten the
buckle.
4. Install the Nuband X app on your smartphone (available free
for Android and iOS devices from the Google Play and Apple
App Store).
5. Follow the instructions on the app to add your information and
connect your Nuband to your smartphone (more information and
screenshots are in the App guidance in this guide).