ONKYO DAC-HA300 SD Player Portable Amplifier

ONKYO SD Player USB DAC Portable Headphone Amplifier
I purchased this new at the end of 2017 and used it about 14 times. After that, my living environment changed, so I stored it in a dark place. My living environment changed again, and I transitioned to wireless, so I thought I wouldn't have a chance to use it. I've decided to sell it, hoping someone interested might use it.
The exterior is in very clean condition, considering the infrequent use. Regarding operation, the battery fully charges in about 4 hours, and I have confirmed sound output with all connections.
This is a bit of a side note, but personally, I thought the sound quality was truly excellent, something that wireless cannot replicate. It reminded me of the high-quality analog sound sources from the golden age of home audio. Sorry for the digression.
As for accessories, I have the cables and cable ties, but unfortunately, I do not have the original box or instruction manual.
Please understand that while I have handled it with care, it has been a considerable number of years since purchase, and it is a used item. I kindly ask that you refrain from making any complaints.
Lastly, I have not performed any firmware updates, but those with a PC may be able to do so. Also, I primarily used it as an amplifier, so the SD player function was only tested and is unused.
I would be happy if someone who appreciates it could use it. Thank you for your consideration.
Thank you for reading this long description to the end.