The MXR micro amp boasts simple operation and high sound quality. - Brand: MXR - Model Name: micro amp - Controls: GAIN knob - Input/Output Terminals: INPUT, OUTPUT terminals - LED Indicator: Equipped - Power: 9V power supply terminal Thank you for viewing. It's been several years since I purchased it, but it's only been used indoors. It hasn't been used much, so it's in good condition. This is a sale of the unit only.