• Compatible with and replaces Google's Nest® Protect Alarm
• Sends alerts to your phone if smoke and CO are detected through the First Alert app
• Interconnect so when one alarm sounds, all compatible alarms in the home sound
• Notifies when the batteries are low, eliminating late night chirps
• Voice alerts with Heads-Up warning tells you the type and location of danger in your home
• Equipped with Precision Detection Technology to help reduce nuisance alarms and provide an early warning