A KVM switch including server units that are respectively connected to computers units, user units that are respectively connected to input-output units inputting and outputting a signal to the computer units, and a main unit that connects the server units and the user units selectively. A semiconductor laser element is mounted on a side surface of a heat sink of a base via a submount, and a light-receiving element is mounted on an upper surface of the heat sink. There are gaps between a post and a bush which control sliding movement of the upper mold. The remaining portion of the result is revealed to the player in an online portion of the game.