SONY 7.1ch Digital Surround Headphone System MDR-DS7500 Product Features 7.1ch digital surround headphones compatible with 3D, realizing sound fields in height and depth. 3D VPT (Virtualphones Technology) realizes sound fields not only in the conventional horizontal 7.1ch configuration but also in height and depth. Enjoy powerful content such as movies in combination with 3D images. HDMI compatible. Equipped with various effects (Cinema Mode / Game Mode / Voice Mode). * No operational problems * No problems with sound or battery. Included Accessories Headphone body Headphone charging adapter Processor body Processor charging adapter No box or instruction manual. * Currently, I have two sets, so I will sell one set. * As a personal impression, I am very satisfied with it because there is no sound interruption during movie viewing, and the impact is quite significant. * Personally, I like it better than the higher-end MDR-HW700DS! * Ear pads (third-party product) have just been replaced. * Basically, I cannot accommodate price reductions or the creation of dedicated pages. * Please refrain from purchasing if you are concerned about minor scratches due to the product being used, or if you have a bad evaluation history. * In any case (even during negotiations), I will give priority to those who buy immediately, so please understand. Surround