Abstract: An automatic switch includes a main body having connector ports provided thereon, more than one or two sets of cable-connected connectors directly extended from the main body, and a circuit board provided in the main body and electrically connected to the sets of cable-connected connectors via signal cables. The main body has an integral enclosure formed through multiple times of injection molding to include a circuit-protecting layer for enclosing the circuit board, an outer case enclosing the circuit-protecting layer, and an anti-slipping layer coating an outer surface of the outer case.