This is the IE 100 PRO, a standard earphone model from Sennheiser, a German audio equipment manufacturer. Please refer to the official website for detailed specifications. Purchased new in March 2025 and used only a few times, it is in almost new condition. The included case and ear tips are unused. Please note that this item is being sold without the original box, as shown in the photos. 〈Regarding Purchase〉 Please make your decision based on the product description and images. We kindly ask that those who are sensitive to the condition of the item or who are unfamiliar with purchasing from flea market sites refrain from considering this item. We will do our best to answer any questions you may have, so please be sure to inquire about any concerns or uncertainties before purchasing. Returns, refunds, and exchanges are not accepted. We are not responsible for any accidents during shipping.