Photo 1 of Naughtbaby FitElf 3 Pro Smart Ring Fitness Tracker, Health Sleep Tracker, Blood Pressure, Heart Rate and Oxygen Monitor Ring for Women/Men, IP68, No Subscription, 10-Day Battery Life (Black, 10)

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Photo 1 of Naughtbaby FitElf 3 Pro Smart Ring Fitness Tracker, Health Sleep Tracker, Blood Pressure, Heart Rate and Oxygen Monitor Ring for Women/Men, IP68, No Subscription, 10-Day Battery Life (Black, 10)Photo 2 of Naughtbaby FitElf 3 Pro Smart Ring Fitness Tracker, Health Sleep Tracker, Blood Pressure, Heart Rate and Oxygen Monitor Ring for Women/Men, IP68, No Subscription, 10-Day Battery Life (Black, 10)