This is a high-quality DI made in Japan. When you turn up the drive knob, it adds a saturation feeling like a tube DI, pushing the sound image forward. Also, since it goes through a preamp, the sound output of the amplifier also improves. In particular, the sound is finished with improved low-frequency resolution. It works great with bass, of course, but also with acoustic guitars. I have used it with both 4-string and 5-string basses, and it has been very useful. This unit is equipped with a paid optional ground lift switch. The main unit, a dedicated power cable, and the original box are included. Thank you.