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'''Legacy Twin:''' This unit is two circular LNB units inside one plastic housing with two outputs. The multiswitched signal combines both satellites 110 and 119 to be carried on a single cable. Two cables may be connected to this unit for two receivers. The Legacy Twin points to two satellites in space.'''Legacy Quad:''' This unit also has two circular LNB units inside one plastic housing, except with four total outputs. The multiswitched signal combines both satellites to be carried on one cable, and up to four receivers may be connected, one cable per receiver. The Legacy Quad points to two satellites in space.'''Legacy Dual:''' Two '''Single LNB''' units are mounted side by side, they are each in their own separate plastic housing. An external SW21 switch is needed to combine the signal from each LNB together. This is intended for supporting only one receiver. The SW21 is a legacy switch.'''Dish Pro Twin:'''