This is a very lightly used Boss VE500 vocal processor, comes boxed with manual and power supply. One of the very best harmony processors on the market, it tracks guitar really well and produces very lifelike voices. Here is what Boss say :-

Packing professional sound quality and serious BOSS DSP muscle, the VE-500 delivers sophisticated harmony and pitch correction functions that automatically track the chords you play on your guitar. It also includes a powerful vocoder and core sound-enhancement tools, plus world-class reverb, delay, and modulation sounds and specialty effects like distortion, filtering, and many others. And with programmable memories, you can instantly recall favorite setups for any song or style. The VE-500 is the perfect addition to the pedalboard of any singing guitarist, providing top-flight vocal processing that fits right alongside your standard guitar effects.

Advanced vocal multi-effects stompbox for singing guitarists

Automatic vocal harmony/pitch correction powered by newly enhanced BOSS algorithms for natural sound with smooth tracking

Class-leading sound quality and high-powered BOSS DSP engine for processing vocals with up to nine effects at once

Extensive selection of effects specially tuned for vocals; Enhance section for shaping core tone, plus reverb, delay, modulation, distortion, EQ, filter, and many other types for further processing

Versatile and creative vocoder effect for generating electronic voice and talk box sounds based on guitar input

Flexible effect routing options for processing live and harmonized vocals together or separately

Dedicated looper

XLR mic input with adjustable sensitivity and available phantom power

Guitar input for harmony, pitch, and vocoder processing; Thru output for sending unprocessed signal to guitar pedals

Stereo XLR outputs for sending vocal sounds to a PA mixer or recorder

Three assignable footswitches for real-time performance control, plus support for up to two external footswitches or an expression pedal

99 user memories for storing patch setups

Three assignable knobs for quick access to essential parameters while performing

MIDI input and USB-MIDI for guiding harmony/pitch engine from an external MIDI keyboard or DAW backing tracks

Editor/librarian software (Mac/Windows) for sound editing and patch management via USB