Why Choose X-Sense? X-Sense’s mission is based on the culture of quality, service and innovation. Over the years, we have devoted our efforts to protecting lives around the world, making our planet a better place to live and work for current and future generations. X-Sense manufactured in accordance with the UL 217 and UL 2034 Standards. SC06 2-in-1 Smoke and Carbon Monoxide (CO) Alarm Combination Detector - 1-Pack. Avoid deadly house fires and carbon monoxide poisoning with this 2-in-1 combination alarm.