It was working. It's been several years, and I don't have the adapter, so I can't confirm its functionality, making it a junk item. It's currently stored in its box. - Brand: SONY - Model: MDR-DS1000 - Board Type: Headphone Amplifier Board This is a junk item, so please purchase it only if you understand this, such as for parts or for repair. Price negotiations are welcome in the comments. I will take measures to prevent sales during negotiations! I may be slow to respond. Please refrain from purchasing if you are overly concerned about details.