A charcoal gray saucer the size of a football field was above the trees right in front of me...it had 3 large lights/windows and

I saw a charcoal gray saucer shape in front of me over the trees...it was football field size...there were 3 large lights/windows ( a light bright green in color) and under each large light there were 4 small lights/windows so 12 small lights in color...the large lights stayed permanently lit but the small lights would blink left to right...1-1 would blink in unison with 2-1 and 3-1....then next would be 1-2 2-2 & 3-2...so on and so forth....the whole sighting didn't last for more than 6 seconds...the craft moved faster than I've ever seen anything move