The AS-1 CO2 alarm kit consists of the DSD-1 dry contact station and the AS-5 acoustic-visual alarm. It can be mounted inside or outside the greenhouse and will trigger an alarm when the CO2 level exceeds the normal or safe range. The AS-5 can be connected to the CBA-1 and the AL-1 or AL-2 CO2 sensors, or even to both sensors for complete redundancy. The package includes DSD-1, alarm, 16ft RJ12 cable, 4ft RJ12 cable and RJ12 T-splitter.