Once you've paired your ring with your phone for the first time, it's perfectly fine to leave your phone at home if you're going for a run, or just want to take some time to unplug. Being a stand-alone device, the ring can store your data for up to 6 weeks (or 3 weeks for the first Oura ring) without syncing with the app on your phone, provided you keep the ring charged. 

Once your phone is in range again (with the app running and your device's Bluetooth enabled), the ring will upload the data to your phone automatically.

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