Fireboy-Xintex CMD6 Carbon Monoxide Detector wInternal Battery The CDM6 Carbon Monoxide detector features an internal lithium battery and utilizes an electrochemical sensor. This top of the line sensor allows for immediate alarms and stablensing to reduce false alarms. The compact design allows for inconspicuous protection. An internal relay allows for generator shutdown or external signal. The CMD6 runs off of a maintenance free internal Lithium battery that has a life expectancy of approximate