【Please read the description and profile before purchasing or asking questions】 I have only confirmed that the lamp lights up when batteries are inserted. Please note that I have not tested the functionality by connecting it to a Game Boy. The serial number on the main unit matches the serial number on the instruction manual. The printing paper appears to be unused. In my subjective opinion, there are few scratches or signs of use. However, this is an old and used item, so there may be unseen scratches or dirt. Please refrain from purchasing if you are overly concerned about the condition.