Battery operated – 2x AA 7-year battery life 10-year electrochemical CO sensor 24/7 continuous monitoring LED status indicators – Green, Amber, Red Built-in alarm memory & event indicator Test & reset button End-of-life replacement warning Sleek, lightweight design Kidde 5CO Carbon Monoxide Alarm – 7 Year Battery Operated Reliable Long-Term Carbon Monoxide Protection The Kidde 5CO Alarm provides continuous monitoring against the dangers of carbon monoxide. Its proprietary electrochemical sensor lasts up to 10 years, giving you peace of mind for long-term protection. Easy to Use & Monitor The alarm is battery-powered with 2x AA batteries supplied. A built-in LED system clearly shows status: green for normal, amber for fault, and red for detected CO. Event Memory & Alerts If a CO event occurs, the red LED flashes every 60 seconds to indicate the alarm has been triggered. A test and reset button ensures functionality at any time. Safe & Low Maintenance With end-of-life indication, you’ll be notified when it’s time to replace the unit, ensuring ongoing safety. Its lightweight, sleek design allows easy installation anywhere in the home.