Dual 31-band graphic equalizer, covering a frequency range from 20Hz to 20kHz. - Brand: YAMAHA - Model: Q2031B - Type: Graphic Equalizer - Frequency Range: 20Hz - 20kHz - Number of Channels: 2ch - Power Switch: ON/OFF - Peak Signal Indicator: Yes - Other: Variable width ±6/±12dB switchable, with high-pass filter Thank you for viewing. The appearance is fair, and I think it's in good condition for PA use. Each slider is stiff to move, but it works normally without any crackling or sound dropout. The high-pass filter and bypass switches sometimes make a crackling sound when turned on or off. The 20kHz slider is missing, but it can be adjusted with a thin screwdriver or toothpick (currently ±0), but since it's not an area I touch often, it wasn't a particular problem for me. There are two places where the slider knobs are missing, and I've moved the 20Hz knob to one of them. In its place, I've attached a replacement part formed from broken pieces using baking soda and instant glue (it doesn't interfere with operation). ...That's the situation. If anyone is interested, please feel free to purchase.