This is a pre-built Nu:Tekt OD-S overdrive pedal kit. It's a full-fledged overdrive pedal equipped with a NUTUBE vacuum tube. It features natural compression and a natural distortion that effectively captures picking nuances. While possessing the warm mid-range of a TS-type pedal, it has a wider range, allowing for an amp-like sound. It also excels as a booster, covering a wide range from crunch to light distortion. Includes instructions, and you can swap out the op-amps and other components to your liking (no soldering required!). It's often featured on YouTube, so please listen to the sound. - Model Name: Nu:Tekt OD-S - Type: Overdrive - Number of Knobs: 4 - Color: Silver - Bottom: Velcro attached Thank you for looking.