The item is a Fostex NM04, a 4-channel input, stereo output mixer. Operation: Confirmed. No sound issues. No crackling. However, the power adapter is not the original, so it's slightly unstable. (It runs on a 9V battery, but this has not been tested.) Condition: Overall, there are scratches, dirt, and missing parts. The rear fixing feet are missing, and cushioning sponge has been used as a substitute. (Ph02) The Ch1 fader is missing, and the master fader has been moved, so the master fader is missing and fixed at the 0dB position. (Ph03, 04) Body size: Approximately 19cm x 13cm Accessories: Power adapter (not original. Center positive 9V) We are unable to offer a discount.