This unit is simply two temperature thermostats on one box. It is perfect for controlling two heaters independently. When a specific temperature gradient is required this is the unit to use. It will control two heaters with a maximum of 300 watts for each channel. This enables each heater to be set at a different temperature , even in the same vivarium. One channel can control the general background heat, whilst the other channel can control a "hot spot" to give the reptiles that essential temperature gradient that is so important to their husbandry. It can alternatively be used to control two seperate heaters in two seperate cages.