The System Sensor SS-PHOTO-CO is an intelligent, multi-criteria detector incorporating photoelectric and carbon monoxide (CO) detection principles. It offers a cost-effective solution that meets both the UL 268 7th edition standard for smoke detection and UL 2075 standard for system-connected life safety carbon monoxide detection. The dual function of this single device makes it ideal for installations such as hotels, schools and high-rise residential applications that require both smoke and CO detection.