From Boss:

Unrivaled Dynamic Pitch Expression

The XS-100 Poly Shifter redefines pedal-based pitch shifting with groundbreaking BOSS technology years in the making. Delivering natural sound, precision tracking, and deep customization options, this powerhouse expression machine transforms how you perform with pitch. Glide up or down four full octaves with the ultra-smooth pedal to infuse your music with evocative new colors. Enhance solos by triggering bold shifts with a single footswitch press. Instantly retune your instrument with drop tunings, capo simulations, and more. And with onboard memories, your favorite setups are always ready when you need them.

Standard Features

• Advanced pitch-shifting workstation with deep control options and an eight-octave range
• Total pitch control for guitar and bass
• Class-leading pitch shifting quality realized with new BOSS algorithms
• Clear response and natural feel that retains the fundamental sound character
• Smooth onboard pedal with integrated toe switch provides linear pitch control across +/- four octaves
• Fixed pitch settings in semitone steps across eight octaves for drop tunings, capo effects, and otherworldly tones
• Detune function (+/- 50 cents) to create rich doubling effects
• Adjustable pedal curve and response
• Fully customizable toe switch and footswitches for momentary pitch changes, instant retuning, and more
• Clear display for editing sounds and 30 memories for storing favorite setups
• Dedicated analog output that mirrors the input signal
• Connect up to two footswitches or an expression pedal for extended control
• TRS MIDI I/O for external control and sending MIDI commands with the pedal and footswitches
• USB connector for system updates”

Brand new.