Reefer containers are being divided into 2 categories, but with all our projects we only use containers with integrated cooling system- (Integral container, Integral-Reefer). Integral containers do have their own cooling unit which is integrated in the wall opposite the front wall and runs by electrical power. Every container can be set separetely to a certain cooling or heating temperature. This will be supervised and recorded constantly by the built in electronics. To compensate the additional weight of the cooling system, the walls of integral reefers are often made out of aluminium. Because of the insulation, Reefer containers are also slightly different in internal width, length and height compared to those of a normal ISO container.