Thank you for viewing! ⚠️ Please read the profile. Free shipping! Instant purchase OK! ※ No need for comments ※ Purchases are first-come, first-served ⚠️ This is an item for the main unit only. There are no cartridges. I've been using it for about 20 years, and I was using it until last month. I have used it for many years, so please purchase it only if you are okay with it being a junk item. There are signs of use, scratches, yellowing, etc., but I have maintained it regularly. Please understand that I do not know about technical matters or questions regarding installation. Please purchase with understanding as it is stored and inspected at a private home by an amateur.