Audio-Technica AT-HA25D DAC Headphone Amplifier

Please read before purchasing.
I purchased this item a few days ago from another seller here. The reason for reselling is that I found a better DAC. However, I wanted to confirm its operation before listing it. The original seller did not include an AC adapter. It came with a strange barrel connector for the AC adapter. So, I desoldered the old connector (see photos) and replaced it with a standard barrel DC connector. I am a beginner, so please only purchase if you are comfortable disassembling electronics and using a soldering iron. I tested it with a center-positive 12V DC adapter after installing the new connector, and it worked perfectly.
This sale includes the main unit and the AC adapter.
How to use this product: Since it's a 2-in-1, you have two options.
Since you asked an important question, I will clarify it here. The original connector was an unusual type, not a common household AC adapter. The reason companies like Audio-Technica and Sony use this is to prevent users from accidentally connecting a center-negative power supply and burning out their electronics. It is easy to accidentally connect the wrong adapter and break the circuit. While it has become easier to accidentally use the wrong adapter, it has also become easier to find a working adapter. We are not responsible for any damage caused by the use of an incorrect adapter at the time of purchase. The product will be video-recorded in operation before shipping.
All knobs, buttons, LEDs, and the new connector function as expected.
Please understand and cooperate as this product has been modified. Please note that returns and refunds cannot be accepted.