A low gain overload, with a unique VOICE knob that can adjust different styles and types of EQ frequency bands. The smooth overload sound reminds you of the classic and legendary D-mble speaker. Features: With independent knob adjustment of volume(VOL), gain, tone, and frequency(VOICE). With a unique VOICE knob that can adjust different styles and types of EQ frequency bands. A low gain overload effect pedal with smooth overload sound effect that reminds you of the classic and legendary D-mble speaker. Aluminum alloy metal shell, durable and sturdy, lightweight and compact. Mini compact size, portable and easy to operate. Equipped with a non slip silicone pad, easy to install, making the effect pedal non shifting and anti slip during performance. Specifications: Material: Aluminum alloy Input Impedance: 2.2M Output Impedance: 1K Running Current: 9mA Item Size: 108 * 69 * 32mm / 4.25 * 2.72 * 1.26in Item Weight: 248g / 8.74oz Package Weight: 291g / 10.29oz Package Size: 12.5 * 8 * 5.7cm / 4.92 * 3.15 * 2.24in Package List: 1 * Effect Pedal 1 * Silicone Pad 1 * Manual (English) Note: Please use a DC +9V power supply which is positive outside and negative to connect this unit and connect the input and output socket to this unit.