This compact effector is packed with features that a non-drive booster needs to bring out the nuances of overtones. It naturally controls the unique overtones of instruments, making it recommended for acoustic players as well. Electric Guitar Booster Overdrive Fuzz Distortion - Model Name: Sonic Shaper - Brand: Guyatone - Number of Knobs: 2 - Power: DC 9V - Input/Output Terminals: IN/OUT Thank you for viewing.