This is the Vintech Audio 273, a 2-channel microphone preamplifier/EQ. It comes as a set with a dedicated power supply. See below for details: https://umbrella-company.jp/products/model273/ The Japanese manual can be found here: https://umbrella-company.jp/corporate/wp-content/uploads/2022/06/vintech-audio_273_manual.pdf This unit recreates a vintage Neve sound with a 2-channel microphone preamplifier and 2-band EQ. The high-frequency EQ offers 5.6kHz and 12kHz options, while the low-frequency EQ offers 60Hz and 110Hz options. In my personal impression, it sounds as good as the rumors suggest, with a prominent and impactful sound. Although it only has high and low EQs, they are quite effective. The frequency switching allows you to select the desired band to some extent, making it convenient for rough adjustments. Also, the impedance switching significantly changes the sound impression. It can also be used as a DI, and since it has two channels, it can be used for both microphones and line-level signals in stereo applications. The current list price for the set with the power supply is over 450,000 yen, but it seems to be difficult to obtain as the manufacturer is no longer taking orders. There are no operational issues. The 273 unit itself shows little signs of use and is in generally clean condition. The dedicated power supply has minor scratches. The dedicated power supply is a product distributed through the domestic distributor, Umbrella Company. (There is nothing on the 273 unit itself to indicate it was distributed through the distributor) In addition to the 273 unit and the dedicated power supply, a connection cable for the 273 and the power supply, and a general-purpose power cable are included.