The FreeStyle Libre 2 sensor is designed to be easy to apply and easy to wear. It represents technology that is designed to liberate you from the hassles of finger pricks. •Requires no finger prick calibration . Eliminates painful finger pricks needed for calibration and is designed to stay on the body for up to 14 days. •Designed to stay on the body for up to 14 days. Only needs to be applied once every 2 weeks.