The JHS Notadumble V1 is a discontinued, solderless DIY guitar pedal kit that accidentally featured a rare Dumble BBC-1 clean boost circuit instead of the intended "Box It Later" circuit.

This pedal features some slight wear as pictured but is in working condition and includes the original box, paperwork and GOOP. Here's more info from online and JHS:

"Overview and Features

• Design: A two-in-one compact stompbox featuring a clean channel/boost and a D-style overdrive drive channel. [1]
• Assembly: Built as a solderless kit assembled in minutes using basic hand tools. [1, 2]
• The "Mistake": JHS intended to clone a clean boost from John Mayer's "Box It Later" Dumble pedal, but mistakenly used the circuit from his Dumble BBC-1 preamp buffer. [1, 2]
• Discontinuation: JHS discontinued the V1 shortly after discovering the error and later introduced the V2 with the corrected circuit, while spinning off the accidental V1 circuit into a separate pedal called the Fumble

CONTROLS

Channel Switch - Selects the active channel. Up is the Drive channel, and down is the Clean channel.

CLEAN CHANNEL (Boost)

Input - Attenuates bass and input gain at the front of the circuit. Fully right has no cut. As you turn the control left, bass and gain are gradually attenuated.

Output - Output volume of the Clean channel. Left is less, right is more.

OVERDRIVE CHANNEL

Drive - Controls the amount of overdrive. Left is less, right is more.

EQ - Adjustable low pass filter. Fully right is no cut, as you turn the control left it lowers the treble cut off frequency..

Volume - Controls the overall volume of the overdrive channel. Left is less, right is more.

Presence (internal trimpot) - Controls the upper-mid range and treble frequencies in the gain stage. Left is less, right is more.

Footswitch - True bypass switching.

JACKS

Input - ¼” jack on the right side of the pedal.

Output - ¼” jack on the left side of the pedal.

Requires 9VDC center negative and consumes 10mA. Do not use more than 9VDC.  This pedal measures  3.7” X 4.7” X 1.66”