Gently used Boss VE-20, does not include box or PSU.
About the VE-20 from the folks who made it:
THE ESSENTIAL STOMPBOX FOR VOCALISTS
Who says stompboxes are just for guitarists? The new, easy-to-use VE-20 has been designed from the ground up for singers, featuring some of the finest vocal-effects technology on the market. With the click of a footswitch, you can instantly add lush vocal layers and harmonies to your singing, add realtime pitch-correction, and you can show your creative side with special effects such as Distortion, Radio, and Strobe. You can even create loops and layers in real time with the onboard Phrase Looper. Perform anywhere with the VE-20 since it runs on AC or battery power.
Specialized effects for vocalists, including Harmony, Double-Track, Dynamics, Reverb, Delay, and more
Create the total of 3-part harmonies and layers
Realtime pitch-correction tools
Special FX, including Distortion, Radio and Strobe
Phrase Looper with 38 seconds (mono) of recording time