This is a wireless headset that provides 7.1-channel sound with a digital surround headphone system. - Brand: SONY - Model Name: MDR-DS7500 - Type: Wireless Headset - Features: Digital Surround Headphone System - Connection Type: HDMI - Surround System: 7.1 Channel - Supported Audio Formats: Dolby Digital, DTS-HD I purchased this at an electronics store for around ¥55,000. I have kept it unopened at home as I haven't had a chance to use it. I took it out of the box for the photos, but I haven't touched the headphones themselves directly. There are no noticeable scratches, but due to personal storage, there is some exterior damage to the outer box, such as scratches and corner dents. The main unit and instruction manual are unused and new. I opened them for the photos. Other than that, there are no major defects to note, but please refrain from purchasing if you are sensitive to minor imperfections or are looking for a completely new item. There is some aging due to personal storage. Please consider this before purchasing. This item was personally owned and stored at home. I am selling it at a lower price than the retail price as part of a decluttering effort. I will take the utmost care in packaging and shipping. Therefore, I kindly ask that you purchase only if you agree to a no-claims, no-returns policy. This product is currently discontinued, but it was very popular, so if you were looking for one, please consider purchasing it at this opportunity. #SONY #MDRDS7500 #WirelessHeadset #DigitalSurroundHeadphoneSystem #Headphones