Wellue O2Ring
Score: 70/100Fitbit Sense 2
Score: 81/100Rankings
The Fitbit Sense 2 is an advanced health smartwatch featuring ECG, SpO₂, stress monitoring and built-in GPS with a 6-day battery life. Its higher weight, region-locked sensors and lack of Wi-Fi may deter power users. Ideal for health-focused individuals who value comprehensive wellness tracking and multi-day use.
The Wellue O2Ring is a ring-style pulse oximeter that offers continuous 1-second SpO₂ and heart-rate monitoring with vibration alerts and IP24 protection. Its modest 12-16 hour battery and relatively heavy 15 g design limit all-day wear without frequent charging. Best suited for sleep-focused users and clinicians needing detailed overnight data.
| Attribute | | Fitbit Sense 2 |
|---|---|---|
2 %best | — | |
| ↓ lower better | 15 gbest | 37.6 g |
2 bpmbest | — | |
| ↓ lower better | — | 12 minutesbest |
— | 1.58 inchesbest |
Click an attribute name to sort · Green = best, red = worst (relative to this comparison)
| Attribute | | Fitbit Sense 2 |
|---|---|---|
Battery & Power(2) | ||
Battery Life (hours) | 12-16 hours | 144+ hours |
Charging Time (minutes) | 120-180 minutes | 12 minutes |
Software(1) | ||
Operating System Compatibility | iOS 9+, Android 5+ | Android 7+, iOS 12.2+ |
Connectivity(1) | ||
Bluetooth Version | 4.0 | LE |
Build & Design(2) | ||
Weight (g) | 15 g | 37.6 g |
Water Resistance (IP Rating) | IP24 | 50m |
Products in the top-left offer the best value (high score, low price).
Professional reviewers commend the O2Ring for its high-resolution 1-second data capture, practical USB-rechargeable battery that lasts about two nights, and robust exportable reporting that supports clinical workflows. However, they caution that the 15-gram weight is relatively heavy for a ring-style device and that the modest battery life may necessitate frequent charging for continuous monitoring.
Users consistently praise the O2Ring's comfort thanks to its soft silicone band, the usefulness of vibration alerts that don't disturb sleep, and the detailed app/PC reports that facilitate sharing data with healthcare providers. Recurring concerns focus on the device's weight and the need to recharge it nightly due to its limited battery endurance.
Professional reviewers commend the Fitbit Sense for its robust health-monitoring suite, especially the on-wrist ECG, stress (cEDA) analysis, and skin-temperature tracking, while also valuing its long battery life and built-in GPS. However, they caution that certain sensors are region-locked and that Wi-Fi is disabled, which may limit some advanced features.
Everyday users praise the Sense for its swim-proof design, interchangeable bands, fast magnetic charging, and the ability to store a full week of detailed activity data. Common complaints revolve around band incompatibility with older models, occasional regional sensor limitations, and the watch's relative weight on the wrist.
“Reliable swimming/lap tracking”
