The Zoom V6-SP Multi-Effects Vocal Processor Pedal is designed specifically for bringing studio-quality sound to vocalists performing live. Packed with professional vocal effects and preloaded patches, harmony generator, built-in looper, formant-shift pedal, high-quality preamp, and USB audio interface, it can be used right out of the box to easily change the character of your vocals, on the fly. The V6-SP is divided into three distinct processing sections. Select your options within the Voice, Harmony, and Effect section, and save them as a patch. Each section can be quickly activated or deactivated within that patch anytime using the corresponding footswitch. The Voice section features 12 voice effects including pitch correction. The Harmony section adds up to two backing vocals for up to three-part harmonies, and the Effect section offers 10 popular classic and modern studio effects. The unit operates up to 3.5 hours on four AA batteries and comes with an AC adaptor.