Sony MDR-HW700DS 9.1ch Digital Surround Headphones I bought these but didn't understand how to use them, so I left them unused. While I handle the product with the utmost care, please understand that it is stored and packaged by an amateur. I may consider a price reduction depending on the reason. Bundling purchases is a great deal. ---------- The realistic and powerful sound is overwhelming. This is a high-end model that allows you to enjoy the immersive sound of a home theater, making it perfect for movies and games. "Your living room transforms into a movie theater - Sony's ultimate wireless surround experience" "Freedom from cords. 9.1ch envelops you" "Loud volume is okay even at night. The best movie time without worrying about your family" Brand: SONY (Sony) Ear Position: Over-Ear Headphone Type: Sealed Dynamic Noise Control: Hybrid Noise Canceling Type: Sealed Dynamic Frequency Response: 5Hz-25,000Hz Impedance: 24 Ω (1KHz) Power: Built-in Lithium-ion rechargeable battery (DC3.7V) Charging Method: USB charging Please check the instruction manual from the following URL: https://www.sony.jp/support/headphone/manual/mdr-hw700ds.html SONY MDR-HW700DS Movie viewing, movie lovers, for gaming Home AV, audio equipment, high-quality headphones Late-night movie viewing, TV headphones Series: WH Series