The First Alert SC7010BA is a hardwired smoke and carbon monoxide alarm that connects directly to your home's electrical system, ensuring continuous protection. It features a photoelectric smoke sensor with Optipath 360 technology, which effectively detects smoke from smoldering fires, and an electrochemical sensor that accurately senses carbon monoxide. Designed with a spread spectrum horn tone, it is easy to hear, especially for those with age-related hearing loss. The device also includes a 2 AA battery backup to maintain operation during power outages. Protect your home with this reliable and advanced alarm system today!