Zendrive effector with adjustable tone knobs. - Model Name: Zendrive - Brand: Hermida Audio USA - Control Knobs: Vol, Gain, Tone, Voice - Input/Output Terminals: In, Out, DC Jack Thank you for viewing. I acquired this used several years ago. Operation has been confirmed, with no issues. No box or accessories are included. It will be wrapped in bubble wrap and shipped. There is a chip on one corner of the back cover, but it does not affect the screw fixation (see photo 8).