The connection block, also known as the distribution box, has internal protection that reduces the noise coming from engines, electrical cabling, power oscillations, and others, apart from linking the controllers to create the communications network. The connection block is added to the following models: MT512E Log, TC900E Log, PCT410E plus, VX1025E plus, VX1050E plus e RCK862. It can also be purchased as an independent unit in your preferred retailer.