Brand New MXR M101 Phase 90This device has found its way into many of Eddie Van Halen's recordings, adding a shimmery velocity to lead passages or a more dramatic swoosh to muted strumming. Not just for guitars; it works well with bass, keyboards and even vocals. Vary the speed from a subtle, long cycle to a fast, watery warble and myriad vintage vibrations in between. Power: Dunlop ECB003 AC Adapter or Single 9 volt battery