Features: With independent knob adjustment of low frequency(LOW), middle frequency(MID), and high-frequency(HIGH). Gain, high frequency, medium frequency, and low frequency provide a wider range of voice shaping capabilities. With high sensitivity to volume changes and differences in performance dynamics. Whether it's the penetrating main voice or the sharp and wide rhythmic voice, it's easy to handle. The high frequency adjustment of 3.5~4.3kHz provides clearer high frequency for SOLO or rhythm sound, easy to control via the Boost knob. 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: 1M Output Impedance: 600 Running Current: 35mA Item Size: 108 * 69 * 32mm / 4.25 * 2.72 * 1.26in Item Weight: 283g / 10.00oz Package Weight: 327g / 11.56oz 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.