Selling to organize my equipment. When compression is set strong, you can get deep compression with even sound. When set weak, you can get a natural sound, making it perfect for use as a booster. Size: 59mm (W) × 111mm (D) × 48mm (H) The unit will be bubble-wrapped and shipped in a box. I have confirmed that it powers on and functions with a 9V adapter. Returns and exchanges are not accepted due to buyer's circumstances. Please check the condition in the photos as this is a used item before purchasing. If you have any questions, please ask in the comments!