The YAMAHA MA2030a is a power amplifier with bass and treble adjustment functions. - Brand: YAMAHA - Model: MA2030a - Features: Bass and treble adjustment - Signal indicators: Yes - Input types: Microphone input, stereo input Thank you for viewing. It works without any problems. There are some minor scratches, but it can still be used for a long time. Thank you. The price is negotiable, but only slightly. Thank you.