BOSS VO1 VOCODER - Innovative easy-to-use Vocoder pedal4 Modes: Vintage Advanced Talk Box and Choir ModeVintage fashion for classic electronic synthesizer voicesAdvanced mode for novel Vocoder sounds with improved clarityTalk-Box Mode allows talking solo guitar soundsChoir mode for a full vocal choral sound even without a microphoneEffects loop for integration of existing effect pedalsWorks with guitar bass and any instrument that can be connected to a 6.3 mm jackControls: Level/Blend Tone Colour ModeDimensions (W x D x H): 70 x 125 x 55 mmPower supply via 9V battery or 9V DC power supply unit (coaxial connection - minus on the inside not included