First Alert 10-Year 2 in 1 Photoelectric Smoke Detector with Carbon Monoxide Alarm, PC910;

Combining safety and style, the First Alert PC910 Combination Photoelectric Smoke and Carbon Monoxide Alarm helps protect your home from fire and dangerous carbon monoxide levels by providing up to a decade of uninterrupted monitoring. This smoke detector uses an ultra-reliable photoelectric sensor to detect smoke from smoldering fires, and it features a patented smoke entry system to help ensure thorough coverage. The unit also features an advanced electrochemical sensor that detects carbon monoxide leaks from multiple sources such as faulty fuel-burning appliances and blocked chimneys. A built-in 10-year lithium-ion battery provides continuous power during the lifetime of the alarm. Measuring a fraction of the size of traditional smoke and CO alarms, this stylish unit is designed to mount unobtrusively on a wall or ceiling. A loud siren sounds if smoke is detected, and a convenient test/silence button lets you easily check whether the alarm is functioning and mute false alarms.