This easy to use CO2 controller determines precisely when to activate and shut-off CO2 generators to maintain user-defined LOW and HIGH CO2 values in the grow room. The unit can deactivate CO2 enrichment during the night cycle and perform CO2 evacuation as well. The CO2 sensor is located in the controller box. INCLUDED MODULES AND ACCESSORIES One main controller box. Three lint filters to protect Co2 Sensor. One user guide. One screw kit.