The Circular Ring 2 is a standout in the smart ring category thanks to its built-in ECG sensor — a first for rings. It also tracks HRV, SpO2, and skin temperature with no subscription required. Ideal for health-conscious users who want ECG capability without wearing a watch.
Sleep staging and sleep quality insights
Continuous HRV tracking with daily score
Blood oxygen monitoring
Built-in ECG sensor — a first for smart rings
No built-in GPS
Daily step and activity tracking
Stress monitoring via HRV analysis
Automatic activity detection
Not available — no display
Cycle tracking via skin temperature trends
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