This used Keeley Neutrino Envelope Filter Auto-Wah pedal is in good condition, offering dynamic, touch-sensitive filtering for guitar or bass. Featuring three filter ranges��High, Mid, and Low��it provides versatile tonal shaping, from funky, quacky wah sounds to smooth, vocal-like sweeps. The Peak control adjusts intensity, while the Direction switch selects filter movement up or down. True bypass switching ensures a clean signal path when disengaged. The pedal operates on a standard 9V power supply (not included). Though showing signs of use, it functions perfectly and delivers the rich, expressive filtering Keeley is known for.