The NC° Band is Natural Cycles' dedicated wearable, designed to take the hassle out of manual morning temperature logging. Worn on the inner wrist overnight, it continuously measures skin temperature and heart rate while you sleep, then syncs automatically to the Natural Cycles app in the morning to update your fertility status. With a 14-night battery life and no extra subscriptions or third-party integrations required, it's built to make daily tracking as effortless as possible.