Precision electronic control for all environmental variables. Outlets for lighting, irrigation, ventilation, and CO2. High accuracy sensors for Temperature, Humidity, and Flood. Optional Photocell (light) and CO2 sensors available. Sensors have flexible 10 ft. cables (25 ft. total with optional extensions). This allows the Plant Pro to be located for easy monitoring and adjustment, even outside the grow room, if desired. The Plant Pro unique simplified operation allows for easy, quick setup using only two control knobs and a large digital display. One knob to select a setting, a display to show the setting, and a second knob to change the setting. Measurements from sensors can also be displayed. Easy to use digital clock provides exact timing. CO2 control includes timed or optional CO2 sensor. Adjustable Fan CO2 Delay allows extra time for CO2 absorption by plants before ventilation fan comes on.