The ONKYO MHP-AV1 is a 2.4GHz wireless 5.1ch digital surround sound headphone that offers comfortable wear and high-quality sound. I have added one more unit, so this is a set of two. Everything in the photos is included. Although the dedicated nickel-metal hydride batteries are not included, commercially available AA batteries can be used. (I was using commercially available rechargeable nickel-metal hydride batteries.) Upon listing, I confirmed that both units produce sound without any problems, and I also confirmed that the volume can be adjusted. As these are old, there is a feeling of use as you can see in the photos, and as shown in photos 4 and 5, there are some areas where the fabric of the headphones is peeling off. What do you think? These are used items and have been stored at home, so please refrain from bidding if you are concerned about the details or are looking for a perfect item. Due to amateur inspection, there may be oversights of small stains or scratches, so please understand. Please take a good look at the photos and if you have any questions, please ask before bidding. Shipping will be via Sagawa Express's Hikyaku Takkyubin (cash on delivery) in the 80 size from Gifu Prefecture. If you prefer to pay in advance, the shipping cost will be 100 yen cheaper than cash on delivery, so please let me know and I will add the shipping cost. We do not handle any other shipping methods, so please understand. Also, I am very sorry, but due to work commitments, shipping will be on the earliest Saturday or Sunday after confirmation of payment, so please understand.