This pedal has been cleaned, tested and is 100% functional. It comes with the original box. Please have a look at the pictures for condition.The MF Ring is an analog ring modulator that is based on the best selling Ring Mod in the world, the Moog MF-102. Its unique tone voicing circuit actually changes the behavior of the ring modulation, allowing for a wider range of modulated behaviors. Create anything from octaves and choral dissonance to harmonic undertones and synthesized lead lines. The expression pedal input provides hands-free control of the Freq control for sound sweeps, pitch shifting effects, and playing between two scales on the fly. Unlike other ring modulation pedals, the MF Ring can also be battery powered.