The Kidde 2-in-1 Wireless Combination Fire Smoke and Carbon Monoxide Alarm can detect fast flaming fires, slow smoldering fire and CO. It alerts users with voice warnings and can be easily paired with the Wink application and hub as part of a connected home environment. With wireless interconnectivity, if one alarm sounds, all interconnected units will sound, alerting you to a potential threat anywhere in your home. If an alarm sounds, it will send you a message on your smart phone, tablet or PC alerting you to a potential threat. The unit is powered by 3 AA batteries (included).