・ Although OPPO has withdrawn from the pure audio market, their audio products at the time were all excellent, and this unit is a compact headphone amplifier that OPPO released with great confidence. ・ The sound quality is sharp and clear, but it also has a decent thickness, resulting in a good balance. The successor, the HA-2SE, felt like it leaned a bit too much towards clarity, and I personally kept this one, but I haven't used it at all recently, so I'm putting it up for sale. ・ In preparation for the sale, 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. ・ Equipped with ES9018K2M, it can play PCM data up to 384 kHz/32bit and DSD data up to 11.2 MHz (DSD256) (according to the manufacturer's announcement). ・ Equipped with a unique fast charging function. 70% charging is possible in 30 minutes. It can also supply power to smartphones (according to the manufacturer's announcement). ・ Price: 39,900 yen ・ The items included are the main unit, original box, various cables, AC adapter for charging, smartphone fixing band, and instruction manual.