This is an amp modeler effect pedal based on the Mesa Boogie Dual Rectifier. I think it's a very realistic modeler. I attached it to an effects board once, so there are some Velcro marks remaining, and I've marked it as "slightly scratched or dirty," but since I've only used this product at home, I think it's in relatively good condition. The multi-functional KNUCKLES '92 REV F DUAL REC AMPLIFIER, with adjustable bass, mid, and treble. - Model Name: KNUCKLES '92 REV F DUAL REC AMPLIFIER - Functions: Bass, Mid, Treble adjustment knobs - Connections: Mono, Stereo output - Power: 9VDC 400mA ISOLATED - Switches: ON, PRESET - Design: Silver-finished metal body Thank you for looking.