BOSS VE-2 Vocal Harmonist Multi-Effects Pedal.

• Auto Harmony function automatically detects chords played on a connected guitar and generates perfectly matching harmonies, even during mid-song key changes
• Solo singers can create harmonies by manually setting the song key with a dedicated panel knob
• Hybrid mode creates harmonies based on both guitar chord input and the manual key setting, perfect for songs where the guitar part transitions between rhythm and lead playing
• 24 harmony types to choose from (12 one- and two-voice harmonies plus variations that provide even fuller sounds)
• Friendly user interface that's simple to use, even for vocalists not familiar with using effects
• Easily dial up reverb and delay effects with a single knob
• Enhance function controls dynamics and applies subtle pitch correction as you sing
• Three memories for storing favorite settings
• Runs on four AA-size batteries or optional PSA-series AC adapter
• XLR mic input with phantom power (phantom power is available even when running on batteries)
• USB audio function for capturing processed vocal sounds into your computer