I've had this for a long time, but I haven't used it in the last few years. I can't do a detailed check, so I'm selling it as junk. Thank you. This is an 8-channel professional mixer with built-in effects and USB connectivity. - Model: ProFX8 - Number of channels: 8 channels - FX function: Built-in effects - Connection terminals: Balanced/unbalanced input - Number of FX presets: 16 types - USB connection: USB input/output Thank you for looking.