Circular is a leading innovator in wearable health technology, specializing in smart rings that provide comprehensive health tracking in a sleek, jewelry-like form. The flagship Circular Ring 2 is a health lab on your finger, featuring clinical-level ECG and AFib detection, on-demand heart rhythm monitoring, and the Kira™ AI Health Coach for actionable insights on vitals, recovery, energy, stress, and sleep. It tracks 13+ health features using sensors like PPG, temperature, and 3-axis accelerometer, deriving 140+ biosignals without lights or buzzes to avoid distractions. Made from titanium with a hypoallergenic interior and durable PVD coating, it’s available in US sizes 6-14, weighs just 3 grams, and is fully waterproof. Battery life lasts up to 8 days in Power Mode or 5 days in Performance Mode, with 30-minute wireless charging. Compatible with iOS and Android via Bluetooth Low Energy, it’s GDPR and HIPAA compliant. Upcoming features include blood pressure and glucose trends. Circular emphasizes subscription-free access to premium tools, with a 4.5/5 overall rating from customers praising its accuracy, comfort, and non-intrusive design-including endorsements from cardiology professionals. They offer 24/7 support, and the ring comes with a wireless charging case, USB-C cable, and cleaning cloth.