This product is an MXR Micro Amp booster. It's a powerful booster that doesn't thin out the sound. I bought it new three years ago and used it a few times live, but I'm selling it because I bought another booster. There are no issues. Thank you. The simple design of the MXR Micro Amp makes it an essential effector for improving sound quality. - Brand: MXR - Model Name: Micro Amp - Controls: GAIN knob - Output Terminals: OUTPUT terminals - Input Terminals: INPUT terminals - LED Indicator: Red LED Thank you for viewing.