I am selling a headset that was used as a learning material for Challenge (Benesse). As a bonus, I will include a mini-player with kanji/vocabulary checks and "Listen Only♪ 5 Subjects" content. 2026/01/01: The headset and mini-player have been tested and confirmed to be working. * The headset has been confirmed to produce sound. * It has also been confirmed that my voice is recognized through the microphone jack on a computer. * Regarding the mini-player, I have confirmed that the built-in program can be heard when headphones are connected. * I have not checked all programs, so please understand that this is just a "bonus." [Other] I have carefully checked the items, but please purchase only if you understand that these are used items inspected by an amateur. ・Please purchase only if you understand that these are used items. (Original price: 1800 yen)