FireAngle Carbon Monoxide Alarm is a 10-year battery powered, sealed-for-life, wireless interlink CO alarm providing complete protection from CO poisoning in the home. It sends a wireless signal to all other Wi-Safe 2 products when it detects CO. Advanced electrochemical sensor calibrated and tested in CO gas. Ideally a Carbon Monoxide Alarm should be installed in every room with a fuel burning appliance. Additional alarms may be installed to provide adequate warning for occupants in other rooms, by placing alarms in rooms in which they spend considerable time whilst awake.