・This is a compact headphone amplifier from Fiio. It's a legendary model that was the current product not too long ago, so no explanation is needed. ・In terms of sound quality, in my subjective opinion, it has a powerful and weighty feel, like a sports-oriented type. ・This model, the "AM3E," has a 3.5mm single-ended output and two balanced outputs: 2.5mm and 4.4mm. It's convenient to connect via Bluetooth, and I used to take it with me occasionally to enjoy music on the go, but I haven't used it at all recently, so I'm putting it up for sale. ・When listing it, I connected it to an iPhone and tested it, and it's working without any problems. ・The main unit is in fairly good condition, as I only used it occasionally, but there are some minor scratches and dullness from use. It's not like new, so please understand this point before purchasing. ・Price: 50,000 yen ・The items included are the main unit, original box, various cables, a smartphone fixing band, and the instruction manual.