Electro Harmonix OPTICAL COMPRESSOR EFFECT, FOOT VALVE

(This text is machine translated) Double valve magic! Using the same professional techniques as the most revered, vintage, high-end studio compressors, the Black Finger delivers truly professional performance compression. Unlike other products on the market, which use 9-50 Volts, the Black Finger's toroidal transformer supplies a voltage of 300 Volts, preserving the attack and providing the hottest compression imaginable. Fantastic sustain, it's a must for any amplified acoustic guitar.