Jim Dunlop MXR Phase 90 Guitar Effects Pedal JD-M101

Phase 90
M101

Rich, warm analog tone.
Add shimmery velocity and dramatic swooshing to your tone.
The timeless phase shifter used on many classic Van Halen recordings.

Phase 90 Info
This 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.

http://www.jimdunlop.com/product/m101-phase-90