I received this as a gift, but we don't use it at home. I'm listing it because I'd like to give it to someone who is looking for it. I haven't checked if a battery is built-in (usually they are set, right...) and the insulator is still in place. This is a current model sold on the official website for 16,500 yen including tax. The outer box has a slight warp. *Price negotiable*