This is the SONY digital surround headphone system, MDR-DS7500. You can enjoy immersive sound perfect for watching movies and playing games. There are some minor scuffs and scratches from use, but there are no operational issues. The ear pads and headbands have been replaced with new compatible parts. When adjusting the volume on the headphones, there may be a "zipping" noise. This only occurs during adjustment, so there is no particular problem with use, but please refrain from purchasing if you are concerned. Regarding the battery, I haven't tested exactly how long it lasts, but it has never run out while watching a 3-hour movie on a full charge. However, since this is a used item, please refrain from cancellations or returns after receipt. This item is stored at home, so please purchase only if you understand this. Thank you. Please contact me before purchasing as it is also listed on other sites. [Brand] SONY [Model Number] MDR-DS7500 [Color] Black [Accessories] 2 AC adapters, Reference Guide (Instruction Manual) MDR-DS7500 (DP-RF7500 + MDR-RF7500) Brand: SONY Structure: Closed-back Wearing Style: Over-ear, integrated left and right Earphone/Headphone Type: Headband Color: Black Earphone/Headphone Features: Sound quality adjustment, Auto power-on function, Auto power-off function, Surround sound, Remote control Low-frequency response (Hz): 5.0 Hz High-frequency response (kHz): 25.0 kHz Wireless/Wired Connection: Wireless Driver Type: Dynamic Impedance (Ω): 24.0 Ω Wireless Standard: 2.4GHz band wireless