Controls night and day length, temperature and humidity control, plus control up to 8 devices (or 7 and a cycle timer), for a balanced climate. All models come as a complete kit. The kit includes: controller, sensors, remote relay switches. Sensors are high accuracy types, for temperature, humidity and CO2. 3 remote relay switches are included for lights and heaters to put on different electrical circuits. The “Pro Plus†model is the same as the Climate Plus model plus 8 additional inputs and outputs, to control advanced functions including automation or alarms which can drive the optional “Text Message†(product no. 703335) option.