MXR EVH Phase 90
From the manufacturer:
The MXR EVH Phase 90 Shifter is a limited-edition version of the legendary MXR Phase 90. The Phase 90 was instrumental in creating the guitar tones on the early Van Halen records; the swirling, spacey sound on such songs as "Eruption," "Atomic Punk," and "Ain't Talkin' 'Bout Love." The EVH 90 captures the warm, hypnotic tone of the vintage "script logo" Phase 90, and with the flip of a switch also delivers an intense, edgier phase tone. It features rock-solid internal construction and an indestructible enclosure to ensure years of flawless performance. Add to this the Van Halen-approved striped graphics from the guitar that changed the world and you have a truly unique piece of rock history.