Fantastic line level shifter in Excellent working condition. I ve had no issues ever with this unit. It s a no nonsense unit with no power needed, and it has 4 quarter-inch ins/outs, 2 at +4 dBu and 2 at -10 dBV for perfect line level accommodation. Run the pairs separately or combine them to bring a line level unit down to instrument level or instrument level unit up to line level. It functions back and forth between balanced and unbalanced lines, and works great in the studio or live at a show.