Thank you for looking. I bought this about 20 years ago and my daughter used it, but it was mostly displayed. I have confirmed that it works by inserting a 9V battery. When turning the volume knob, there is occasional crackling, and there are also some rust spots. Please judge from the photos, and those who are sensitive should refrain from purchasing. Thank you. Since the scale is small, I think it would be perfect for guitar practice for women and children with acoustic sound.