I purchased this new about three years ago. There are no operational issues. It comes from a smoke-free, pet-free environment. Geshelli Labs is an American garage manufacturer, and it has some recognition on YouTube, Head-Fi, and Reddit. It's not extremely well-known, but it has a good reputation. Please ask ChatGPT or similar. This unit only has DAC functionality; it does not have a headphone amplifier. XLR and RCA outputs are simultaneous; there is no selection option. The included plug allows for use with Japanese outlets. I have added the optional Amanero USB Module and wood shell. The DAC chip is different from the current model, but the specifications from that time are not available on the website. I believe the DAC chip was ESS 9026PRO. You might be able to see it by opening the lid. When I inquired about removing the acrylic cover, I was told that it might loosen due to the wooden construction, so please do so at your own risk. I don't think there are any functional changes from the current model. The following is automatically entered by Mercari. Please check the website and review sites. https://geshelli.com/product/jnog2-socketed-j2s/ #USBDAC #DAC - Brand: GESHEL - Model: DAC - Connection terminals: RCA, XLR - Accessories: Power adapter, cable, storage bag Thank you for viewing.