Overdrive Effect Pedal Product Features Three functional knobs: volume, tone, and gain for precise sound control. Delicate and dynamic overdrive effect that reveals detailed sound nuances. Wide gain range adjustable via the GAIN knob, from BOOST to distortion. High-quality aluminum alloy shell: durable, lightweight, and compact. Miniature design: portable and user-friendly. Non-slip silicone pad included for stability during performances. Specifications Material: Aluminum alloy Input Impedance: 1MΩ Output Impedance: 550Ω Running Current: 17mA Item Dimensions: 108 x 69 x 32mm / 4.25 x 2.72 x 1.26in Item Weight: 248g / 8.74oz Package Weight: 294g / 10.39oz Package Dimensions: 12.5 x 8 x 5.7cm / 4.92 x 3.15 x 2.24in Package Includes 1 x Effect Pedal 1 x Silicone Pad 1 x Manual (English) Note Please use a DC +9V power supply with positive outside and negative to connect this unit. Ensure the input and output sockets are properly connected.