The Kidde 30CUA10 is a professional-grade, 2-in-1 safety device designed to provide continuous protection against smoke and carbon monoxide. This hardwired 120V AC unit features a 10-year sealed lithium battery backup, eliminating the need for battery replacements throughout the device's lifespan. It utilizes advanced photoelectric sensing technology to detect smoke over 25% faster while significantly reducing nuisance alarms caused by cooking or steam. An electrochemical sensor provides reliable detection of carbon monoxide. For comprehensive home safety, the alarm is interconnectable with up to 24 Kidde devices, ensuring that if one alarm sounds, all connected units will activate. The unit includes a loud 85-decibel siren, multicolor LED status indicators, and a test-hush button for easy maintenance. It meets the latest UL 217 9th Edition and UL 2034 4th Edition safety standards