There are 10 filters included on a single square. These work best in a dark room. They can be combined/stacked, but are not really intended to. To turn each filter on, use triggers: M1,M2,M3,M4,M5,M6,M7,M8,M9,M10 To turn each filter off, use triggers: M1-,M2-,M3-,M4-,M5-,M6-,M7-,M8-,M9-,M10-