Based on the search results, "Keune" is a well-known professional hair care brand that specializes in hair coloring, styling, and treatments. They offer products like Keratin Straightening Rebonding System kits and straightening creams that are used for permanent hair straightening in salons. These chemical-based products are designed to straighten hair without the use of a heated styling tool.

However, Keune has also sold some heated styling tools, such as the Keune Titan Hair Straightener, which features titanium-coated plates and a wide range of temperature settings. Another tool that has appeared in some retail listings is a "KEUNE Keratine Therapy Hair Straightener".

The number "2117" does not correspond to any known product code or model number for a Keune-branded hair straightener or treatment. It is possible that this is a product code from a third-party distributor or a less-common model. It is also possible that a brand that is not Keune uses this product name, and it could be a generic product mislabeled with the Keune brand name.