Simplex 4098-9770 TrueAlarm CO Sensor Base, Standard OperationSimplex CO sensor bases combine an electrolytic CO sensing module with a TrueAlarm analog sensor to provide a single multiple sensing assembly using one system address. The CO sensor can be enabled disabled, used in LED Switch modes and custom control, and can be made public for communication across a fire alarm Network. Specifications: Weight 0. 2 lbs Manufacturer Johnson Controls Condition New Type Detector Base Style Standard Detectable Medium Gas