Circular brings mobile payments to its 3 Series smart ring

The Circular Series 3 smart ring adds NFC payments compatible with Visa and MasterCard alongside a vibration motor for haptic alerts. The Ring 3 Pro features an ECG sensor and 12-day battery life, while the smaller Ring 3 Slim omits the ECG and haptic motor to achieve a reduced 5.9mm width and 2.35mm thickness.