• Ionization Sensor
• Quick Plug-In Power Connector
• 120 VAC; Interconnectable
• Alarm Indication
• Battery Drawer Lock
• Mounting Bracket Lock
• Swing-Open Battery Door
• Battery Activation Tab
• Battery Back-Up
• AC Power Indicator
• Low Battery Warning "Chirp"
• Missing Battery Tab
• Easy Install Mounting Bracket
• 9V Battery Included