This product works on the following models ModelModel NameSupport Link NEFAX635Nec Fax-Laser Nefax 635NEFAX635 Parts and Support NEFAX637Nec Fax-Laser Nefax 637NEFAX637 Parts and Support NEFAX647Nec Fax-Laser Nefax 647NEFAX647 Parts and Support