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Connect 3 video devices (such as XBOX DVD PS2) to the "Input1, 2, 3" connectors while your TV to the "Output" connector with the offered RCA cable. Then, at once you want to use one of the three connected Video devices, just pull the switch to the relative "Output 1, 2, 3" rather than discommodiously reconnect the video devices again and again.Convenient to use.