An easy-to-use alternate solution to HTC Climate Controller: just connect your fan, your dehumidifier or humidifier, your CO2 generator, set the knobs and you're ready! Two built-in LVC1 (Low Voltage Relays) to control high power HVAC Systems (A/C, Dehumidifyier...). Optional output boxes for heating (OB2) and fan speed control (OB2-V) Sold Separately. Also includes these smart features: - Empty CO2 Tank Detection - Automatic Competing Equipment Detection - High Temp and Low Temp Limits ETL Listed INCLUDED MODULES AND ACCESSORIES One main controller box with one power cord. Three lint filters to protect Co2 Sensor. One user guide. One screw kit.