I was using this as an audio interface on the go. It's a MAYOT SPECTRA X (USB-C connection), a high-quality DAC. You can connect it to your smartphone or PC for a high-resolution audio experience. I purchased it during the crowdfunding period, so I've used it quite a bit, but it's in good condition, I think. Includes the main unit and a dedicated case. Operation has been confirmed. Equipped with an ESS DAC chip, it features clear and natural sound quality. It can be used directly with smartphones, tablets, and PCs with USB-C ports, making it recommended for audiophiles and those who want high-quality playback on the go. I will re-check the operation before shipping and carefully package it. Feel free to ask any questions! #MAYOT #SPECTRAX #USBCDAC #PortableDAC #HighQualityAudio #AudioEquipment #HeadphoneAmp #DACamp #TypeCAudio #HiRes