Boss RV-6, Boss RV-6, studio reverb in a pedal format, compact and versatile reverb pedal with rich, expansive  sound, dial in sophisticated, top-level reverb tones quickly with simple controls, newly developed studio-grade algorithms powered by cutting-edge BOSS technology, eight sound modes provide a diverse range of ready-to-play reverb effects, expression pedal input for controlling reverb level, supports mono or stereo operation,  controls: E.level, Tone, Time, Mode, pedal switch, powered by a 9V battery or 9VDC power supply (not included), current draw: 65 mA, dimensions: (W) 73 mm x (D)129 mm x (H)59 mm, weight: 450 g.