Used item. Operation confirmed. I believe there are no noticeable scratchy noises. Cleaned. *Tape residue present. *Although it is covered in scratches, it is a heavy-duty device and operates normally. The switch feels slightly loose. Recommended for those who understand that it is used and those familiar with audio equipment. *The following is a description found online. I hope it helps. BOSE Model number: 1705 2 ・The entire body case uses aluminum die-casting, which is designed to be used as a heat sink. A simple, compact 2-channel power amplifier that is also popular for professional use. It is a simple, compact 2-channel power amplifier that is also popular for professional use. It is equipped with slide volume controls that allow independent volume adjustment for left and right channels. It incorporates a dedicated equalizer circuit that best drives the 101 series, and has the same width and height of 60mm as the 101MM. It uses a strong aluminum die-cast body with high heat dissipation. *This is a product with scratches. Please refrain from purchasing if you are concerned.