Kidde 21033083 Firex Series 30CUAR Combo Smoke CO Alarm, Hardwired with AA Backup Battery

Modern 5" combo alarm that detects both smoke and carbon monoxide in a single, cost-effective device. Features a 10-year worry-free backup battery—no replacements needed, saving up to $40 over its lifetime. When one alarm sounds, all interconnected units activate, ensuring faster emergency response. Advanced sensing technology minimizes false alarms from cooking. Includes easy twist-and-click mounting bracket for simple installation. Built-in diagnostics confirm the alarm operates reliably. After 10 years, a single reminder beep signals replacement time—no disruptive low-battery chirps.