The item is in mint condition and comes with its original box

From Darkglass:

The Duality is a unique fuzz pedal that contains two discrete fuzz circuits—a gated saw-tooth wave and a raunchy high-gain sound—which can be mixed together to yield a vast selection of distinct sonic textures.

Front features

Level
Sets the volume of the overdriven signal.

Duality
Mixes two discrete fuzz circuits. Set it at minimum for a pure gated saw-tooth wave, or crank it up for a tighter high gain fuzz.

Dimensions
Width: 50 mm /2″
Length: 45 mm/ 1,75″
Height: 100 mm / 4″
Weight: 205 g / 0,45 lb

Warning
The Duality Fuzz has a current draw of 30 mA. Only use a regulated 9V DC adapter with a center-negative plug. Unregulated power supplies and/or higher voltages may result in suboptimal noise performance and even damage your unit.

Back features

Blend
Mixes the clean input signal with the overdriven signal. The clean signal remains at unity gain while the volume of the overdriven signal is set by the Level knob, allowing for fine control of the blend ratio.

Filter
Controls the amount of high frequency content in the fuzz signal.

Technical Specifications
Input Impedance 1 MΩ
Output Impedance 100 kΩ
Current Consumption ~40 mA
Voltage 9V DC (Center Negative)