Phone to Ring Proximity: General Guidelines
How close does your Oura Ring need to be to your device?
Once you've paired your Oura Ring with your device, it's fine to leave that device at home as you go for a run, take a swim, or partake in another activity that doesn't allow your device to be on hand. As a standalone device, the ring can store data for up to 6 weeks without syncing with the Oura app. Your Oura Ring will also collect data if you've enabled Airplane Mode.
Once your phone is in range again—with the Oura app running and your device's Bluetooth enabled—the ring will upload the data to your phone automatically. Bear in mind that data uploads may take longer if you've been away from your device for longer than normal or choose to enable Airplane Mode for an extended period.