Protect your family from harm with this First Alert battery-powered smoke and carbon monoxide detector. Photoelectric smoke sensing technology detects slow, smoky and smoldering fires and reduces nuisance alarms caused by shower steam or cooking smoke. This detector also alerts you at the first sign of carbon monoxide, helping you avoid exposure to potentially fatal gas. The voice and location feature notifies you of danger's origin, so you can easily avoid unsafe areas. It also tirelessly interconnects with other detectors in your home, so that when one alarm is triggered all detectors will sound. A front-load door makes battery replacements a breeze, allowing you to keep your loved ones safe at all times.