Booster guitar effect pedal. 3 Controls by Low, High and Level. Low to adjust the low frequency of under 250Hz up to be 14dB amplified or lost. High to adjust the high frequency of above 1KHz to be 14dB amplified or lost | True bypass hardware switching. Ultra low noise operation. Beautiful art design on the top, and diamond cut along the edge | Made of reliable high-quality aluminum alloy, anti-skid rubber pad on the backside for stability and friction prevention | LED status indicator; user manual included; no batteries needed, powered by an AC adapter (NOT included) delivery, 9V DC, internal negative, external positive | Measures 3.7 by 1.9 by 1.66 inches / 94 by 42 by 48 millimetres; backed by Sondery 1-year limited warranty