The Electro-Harmonix Hum Debugger eliminates annoying 50/60 Hz hum without affecting your tone. Thanks to advanced digital filtering, noise effortlessly disappears while sustain and harmonics are preserved. Choose between Normal or Strong mode depending on your environment. Perfect for guitars with single-coil pickups or for silent studio recordings. Plug it in, switch it on, and experience complete silence — your sound, but purer.