A wavelength tunable device for use in a wavelength division multiplexing system comprising a display device for displaying at least one operating wavelength of the wavelength tunable device. The guide comprises a mast slidably and rotatably attached to a clamp, an arm slidably and rotatably attached to and end of the mast opposite the clamp, and an up-stop rigidly attached to an end of the arm opposite the mast. Additionally, for each data object, temporal states are maintained over time. The pillar lines are of a first type that act as local bit lines and a second type that provide access to the word lines by having respective memory elements preset to a permanently low resistance state for connecting second-type pillar lines for exclusive access to respective word lines. The game time controller is configured to measure a time for which the first terminal is coupled to the game device, based on the information obtained by the acquisition module, and to prompt the second displaying device to exclude the connection between the first terminal and the game device, when the measured time reaches a predetermined time set in advance. With this, single-phase three-wire output terminals are formed by the single-phase two-wire output terminals of the generators using the connector as a neutral line, without a communication line.