This is an iMod modified iPod (USB-C analog output + Taptic Engine installed). The storage capacity within the iPod is SDXC 256GBx2=512GB, iFlash Quad, and the back panel uses the original 30GB model, which is almost scratch-free. The front panel, storage, click wheel, and center button are gray. The battery is approximately 1000mAh (4.0mm thick), and the headphone jack, dock bezel, and LCD panel have been replaced with new ones. A Taptic Engine for iPhone is installed, so you can enjoy the clicking haptic feedback like turning the Digital Crown on an Apple Watch (and of course, there's a clicking sound). All parts are arranged with minimal clearance and housed in a thin backplate (this is the limit with the iFlash Quad combination). Originally a 30GB model, MA146J/A, so the song limit in iTunes is around 20,000 songs. What is iMod: It's a well-known iPod modification where the DAC direct-connection capacitor is removed, and high-grade audio capacitors are installed inside the iPod to improve sound quality. This uses UTSJ 16V 47uF and 4N pure silver stranded wire 10/0.12 (FEP coating) as the core wire, only for line output (the original iMod). Audio-grade silver solder is used, so there should be no factors that degrade the sound. Please use the iMod line output with a USB-C passive adapter to connect to a portable amplifier or external amplifier. However, although pure silver wire is used for the internal wiring, the passive USB-C adapter is poor, and it's a shame that existing iPod-compatible devices become unusable in practice. Regarding sound quality, I have received reports that it has the "best sound" for an iPod. It has also been evaluated as having the "best sound quality" compared to other creators' iMods. I hope you can hear the true value of the Wolfson DAC without the placebo effect. You can play 24-bit high-resolution audio with RockBox, and it can be played with iMod sound quality without skipping. Please refrain from comments asking for a price reduction.