Purchased used. I am selling this because I stopped using it after about three months after buying something else. This is a custom IEM version of the company's U12t. It has a configuration of 12 BA drivers per side: 4 for low frequencies, 6 for mid frequencies, 1 for high frequencies, and 1 for ultra-high frequencies. e-earphone new reference price: 384,900 yen It has a custom 2-pin connector and is a beautiful item with no scratches or stains. There are no problems with the sound. I think it's a good deal even considering the cost of reshelling! I will stop lowering the price for now! I am also selling it on other flea market sites with lower fees, so if you want to buy it cheaper, please take a look!