First Alert 1039879 Smoke (SA303) & Carbon Monoxide (CO400) Detector Combo Pack

• Model number SCO403;• Bundles together a smoke alarm & carbon monoxide detector;• Ionization smoke sensor reliably detects smoke from fast-flaming fires;• Electrochemical sensor accurately detects carbon monoxide;• Battery-operated alarms install easily without the aid of an electrician;• Loud 85dB alarms;• SA303 has 10-year limited warranty & CO400 has 5-year limited warranty;• Includes 2 9V batteries & mounting bracket;