This is an Audio-Technica Bluetooth portable headphone amplifier. I'm selling it because I've started using something else and it's just been sitting unused in my room. I used it daily, so the battery life has diminished, but I remember being able to use it without problems for my commute (just over an hour each way). Charged and operation confirmed on 2025/12/11. No box. Only the main unit and clip shown in the photos are included; nothing else is included.