The Fender Mustang Micro is a compact wireless guitar system featuring AMP, EQ, and EFFECTS functions. - Model Name: Mustang Micro - Functions: AMP, EQ, EFFECTS, MODIFY buttons - Brand: Fender - Power Switch: ON/OFF switch - Adjustment Knob: Volume adjustment knob Thank you for viewing. I purchased this new about a year ago, but I haven't used it much, so I'm putting it up for sale. There are no particular problems with its operation.