There are also indicator lights located on the face of the unit display, and these are responsible for the visual alerting of all users during an emergency. The SCO5CN smoke detector features a photoelectric sensor and an electrochemical Carbon Monoxide sensing technology that work together to help the device effortlessly detect the larger particles often found in a smoldering fire. Its use of batteries means that installation and set up takes a shorter time and doesn’t demand any extra skill or knowledge. You can change your battery quickly when it runs down via the EZ access battery drawer included in the design of this unit. This feature prevents you from obliterating your alarm from the ceiling, and also makes the replacement process simpler. Just like other First Alert products, this smoke detector has been engineered to surpass all the set UL standards concerning the design of smoke detectors. The SCO5CN smoke detector and carbon monoxide detector is one of a kind in our current market. It can undertake both functions thanks to the dual sensors it possesses, and this keeps each function independent and separate to avoid confusion. The rate of false alarms is also reducing drastically due to the use of a photoelectric sensor. The sound produced during an emergency is unique and loud enough to make users and home occupants aware of impending danger. First Alert is a brand that seeks to reduce the occurrence of CO poisoning through the design of this detector.