The Kidde 10-Year Worry-Free Smoke & Carbon Monoxide Detector, Lithium Battery Powered, Fire Alarm provides long-term protection for your family. It operates on a sealed, tamper-resistant lithium battery, lasting for 10 years without replacement. Using photoelectric and electrochemical sensing technologies, it detects visible fire particles and alerts to carbon monoxide gas, even during power outages. The detector warns of fire, carbon monoxide, or low battery with a blinking LED light and sound pattern. Features include hush mode, peak level carbon monoxide memory, and a test button. The unit is UL Certified with a 10-year limited warranty, meeting various safety standards. The lithium battery eliminates low battery chirps, and the unit automatically activates when attached to the mounting bracket. It is recommended for whole-home protection, with a photoelectric sensor for early fire detection. Compatible with other Kidde products, it meets 10-year legislation laws and comes with a replacement chirp after a decade of operation. Ensure compliance with local building and safety ordinances for smoke and carbon monoxide alarms.