Set of three lights (green, red, clear) noticed setting still in the sky for about one minute. Moved to the left rather quickly stopped abruptly sat still for a little longer than a minute. Moved back to the right faster than to the left stopped abruptly again. Hovered for about two minutes and then moved off to the north at a slow pace. This sighting was during the fireworks for Detour Village and Drummond Island. Lights were over Lake Huron almost to the Detour Passage. If I had to guess the craft/lights were at about five thousand foot. When there was movement the lights would change from one green one red and gone clear/white to all green or all red and being multiple of the same color. Seemed it was investigating the fireworks. No noise was heard either.((NUFORC Note: Witness, who elects to remain totally anonymous, provides no information. PD))