This is the popular FiiO BTR7. I recently purchased it from e-earphone (B-rank, 13,200 yen). There are some light scratches on the top. I believe there are no issues with its functionality. Unfortunately, I've decided to sell it because I acquired a higher-end model used at a bad time. It had been a while since I used a dongle DAC, but I could understand why it's popular; the sound was dynamic. Below is an AI-generated introduction: The FiiO BTR7 is a THX-certified Bluetooth DAC that supports high-resolution audio, making it ideal for improving sound quality. - Brand: FiiO - Model Name: BTR7 - High-resolution audio support: Yes - THX certification: Yes - MQA support: Yes - Color: Black Thank you for looking.