We can flexibly accommodate category changes. This is a high-resolution, high-quality DAC equipped with the CB1200AU chip. The sound quality will be significantly better than your smartphone's headphone jack. It has a USB-C port, making it compact. I have confirmed that it works with my Android smartphone, iPhone, MacBook Air, and Surface. Since it is brand new and unused, we cannot address initial defects or compatibility issues. If you are concerned, we will test it beforehand. Please contact us in the comment section immediately after purchase. The photos were taken after opening the product for photography. The product to be shipped is brand new, unused, and unopened. The product packaging may have dents or scratches from shipping, so please consider it as a bonus. It will be packaged with air padding and shipped via Yu-Packet Post Mini. The color is gold.