US catalogue
Smart rings / Manufacturer
Compare the listed models, check each US purchase package and follow the original sources.
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A titanium ring for iOS and Android with ECG, PPG, temperature and motion sensors, about 8 days per charge in power mode and a wireless charging case; core features come without a mandatory subscription.
Purchase packages
Circular Ring 2 Obsidian Black, buyer-selected size (US)
Some rings pair only with Android or with one brand of phone, and some features need a particular phone. Read the stated phone and app requirements before choosing a finish.
A membership can be required for most insights, optional for add-ons, or not offered. A free first month is a trial, not a permanent entitlement.
Battery and weight change with ring size, and makers test under their own settings. Water ratings use ATM, IP or meter figures with conditions that are not interchangeable.