This is the TECH 21 VT Bass. It's an effects pedal that recreates the Ampeg SVT, and can be used as a preamp or as a distortion effect. It was used on location, so it has some scratches. Please refrain from purchasing if you are concerned about this. No box or manual. Description: VT Bass effects pedal for a variety of sounds. - Model Name: VT Bass - Brand: TECH 21 - Controls: LEVEL, MID, CHARACTER, DRIVE, LOW, HIGH - Country of Manufacture: MADE IN U.S.A. - Connectors: OUT, IN - Power: DC