Just Video – Electro Harmonix Nano Doctor Q Envelope Filter Guitar Effects Pedal

It comes equipped with a 9-volt battery and can also be powered by an optional 9-volt power supply

Instant Pro Vocal Harmonies: Add 1-2 realistic harmony voices controlled by your guitar—perfect for solo artists or bands needing rich vocal layers without extra singers. Studio-Grade Reverb for Live Gigs: Three professionally tuned reverb styles (room/hall/plate) enhance your vocals, making every performance sound polished and immersive. Adaptive Tone – Your Vocal Tech: Automatic EQ, compression & de-essing ensures crystal-clear vocals, cutting through the mix without feedback or muddiness. Plug & Play for Busy Singers: Auto mic gain setup means no fiddling with knobs—just step on, sing, and let the pedal handle the tech while you perform. Flexible Power for Gigs Anywhere: Skip cables with battery-free operation (uses 9V adapter, sold separately) or go cord-free for quick sets—ideal for pubs and festivals.