SONY Digital Surround Processor This is the SONY MDR-DS1000, a famous SONY headphone amplifier. It has music mode and movie mode, allowing you to easily enjoy powerful sound quality when listening to music or watching movies. There is some yellowing, but the main unit is in relatively good condition, I think. Operation has been confirmed. ■ For used items, please refrain from purchasing if you are sensitive or overly concerned about the condition, or if you are seeking perfection. Please purchase only if you understand that these are used items. ■ If you have any questions or unclear points in the description, please feel free to ask. ■ The items for sale are only those in the photos and description, so if you have any questions about accessories or the condition of the product, please be sure to ask and make your purchase after you are satisfied. Please refrain from asking questions about the item after purchase. ■ No confirmation is required for purchase. ■ If there is a discrepancy between the description and the photos, the photos take precedence. ■ After purchase, we manage the serial number to prevent swapping, return fraud, etc., but please use 【3eN】. If you don't understand the meaning of 3eN, please be sure to search and understand it before purchasing. #HeadphoneAmp #Amp #SurroundHeadphones #Headphones