Thank you for viewing. I am selling the SounDroid Typhoon SDT-A10 Redshoulder. This is a model that has been modified from the standard model by changing the op-amp to muse8920 and the screws to red screws. I purchased this item used this fall to listen to my iPod in high quality, but since my iPod was not an upsampling-compatible model, I used it a few times connected to my PC. I like the sound, but I have other headphone amplifiers, so I am selling this to organize my equipment. From the time of purchase, there were traces of a sheet, probably like "Oyaide Electric's Pota Pita Sheet Strong" (see image 5). In addition, there are many scratches on the exterior, and some rust? or dirt? can be seen on the volume knob. I have included many photos, so please check the appearance in the images. As mentioned above, I have only used it for a total of about an hour connected to a PC, so the degree of battery deterioration is unknown, but since it is an old product, there is likely some battery deterioration. The only included accessory is the USB cable. (It was included when I purchased it used, and I have not used it.) If you have any questions, please ask in the comments. Thank you for your consideration.