If you're looking for endless sustain or even Ebow like effects look no further! This kit is powered by a 9v battery. It has 2 modes (Standard and Harmonic). You get unbelievable harmonics when in harmonic mode. I use it mainly in the standard mode for Ebow like effects using chords instead of a single note. If you've never played a sustainer pickup set go check it out! It may not be for everyone but it can definitely give you creative ideas for writing. NOTE: If you are considering installing one of these bad boys in your guitar there's quite a bit of using wood tools (router) and some soldering. If this intimidates you Id take it to a shop and get them to do it.