Smart rings whose product listings explicitly state ECG or electrocardiogram features. These consumer features are not a medical diagnosis.
Heart Pattern Smart Ring Waterproof ECG Heart Rate Blood Oxygen Blood Pressure Sleep Tracker, with Charging Case | R30-WearableMaster
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This product has multiple variants. The options may be chosen on the product page
Smart Ring, Supports Health Monitoring / Camera Control | R1005-WearableMaster
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This product has multiple variants. The options may be chosen on the product page