This is the SSL (Solid State Logic) 4-channel microphone preamplifier/D.I. "Alpha VHD Pre." Thanks to VHD technology, it adds overwhelming depth and airiness. With 4 channels, it was used not only for vocal microphones but also for recording instruments. ・As shown in the photos, I believe it is in beautiful condition, but there may be very small scratches, so please check the photos. ・One owner, a product from a domestic authorized dealer. ・Operation has been confirmed. ・Used only in a private studio with no smoking, no pets, and air conditioning. ◾️Included Accessories ・In addition to the main unit, a power adapter is included. ◾️Operation Confirmed As of today, there are no problems at all. No claims and no returns accepted.