This is an in-train announcement system for JNR (Japanese National Railways) type trains. Contents: Control amplifier (microphone) Output amplifier HP1 H2 (installed on 115 series, 103 series, etc.) Announcement system power supply Condition: The announcement system power supply will operate immediately when the cable is plugged into an outlet. I have confirmed all functions using a railway song music box for the listing. There are no problems with making announcements. All you need is a train speaker or a home speaker (connected with red or black copper wires) to start playing with it immediately after arrival. Please comment if you have any other questions. Due to the nature of the item and the high shipping costs, the price is set as such. Thank you for your understanding. #115series #103series #189series #485series