This is a vintage Digitech Studio Quad, an original 4 in 4 out multi-effects processor in a classic black color. The unit is a combination of analog and digital technology, and it was manufactured in the United States. With four channels and a variety of effects, this unit is an excellent addition to any professional audio setup. Whether you're using it for live performances or recording sessions, the Digitech Studio Quad delivers high-quality sound and versatility. It's a must-have for any musician or audio engineer.