This is a miniaturized version of the Electro-Harmonix LITTLE BIG MUFF. It's an effects pedal with volume control, a tone switch, and a footswitch. I purchased this approximately 40 years ago and have been storing it at home, but I'm selling it as I have no use for it. The original box and instruction manual are not included. Also, the rubber foot is missing. - Model Name: LITTLE BIG MUFF - Brand Name: electro-harmonix - Function: Volume Control - Switches: Footswitch, Tone Switch The unit itself functions without issue, but please understand that this is a model from over 40 years ago. Sold as-is, no returns. Thank you for looking.