This is the heart of your Frolight System. It will operate in 3 ways: manually with a knob, automatically at a set temperature or automatically via the MyFrolight platform. Connect up to 1200 meters of IR tube (maximum 450 meters per phase). Only use one master per area. If the area is bigger than 1200 meters, add one or more slave unit(s) to your order. A heartbeat LED will indicate if the system is running.