Unobtanium, a guitar effects pedal with versatile tone adjustment capabilities. - Brand: Crazy Tube Circuits - Model Name: Unobtanium - Controls: Volume, Gain, Tone, Emphasis, Treble - Switches: Buffer, Stock, Mod - Accessories: Original Box This is a Dumble-like overdrive. It has a send/return, allowing you to insert effects between the left and right channels, enabling a wide range of arrangements. You can get a significant distortion by turning both on. Works perfectly. Thank you for looking.