Features: With independent knob adjustment of low frequency(LOW), intermediate frequency(MID), and high-frequency(HIGH). Can be simulated tones of different speakers by adjusting frequency response, distortion characteristics, and DRIVE. Suitable for guitar, bass and other electroacoustic products. Aluminum alloy metal shell, durable and sturdy, lightweight and compact. With a LED indicator to show the working status. 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: Color: Light Blue (California sound ) / Blue (AC Tone sound) / Gold (American sound) / Purple (British sound) Optional Material: Aluminum alloy Input Impedance: 1M Output Impedance: 1K Running Current: 5mA Item Size: 108 * 69 * 32mm / 4.25 * 2.72 * 1.26in Item Weight: 261g / 9.20oz Package Weight: 306g / 10.80oz 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.