... 18X~37X, Plastic shell, metal inner structure.Indoor High Speed Dome High speed dome,128 prests,multiple protocol,multiple module compatiable,18X~37X, ... . Functions like tour, tack, group motion, color to B/W, B/W to color and timing transfer though week, 4 periods ... motion, swing, auto-recovery against power-down.8. Multiple level speed: 360°continues and endless pan, 180° tilt, 300 million steps ...