[. . . ] Disco Strobe(FL-045B) Introduction Congratulations on purchasing a GENI strobe light. [. . . ] Features Speed control Synchronous operation of multiple units with the FL-01C controller (sold separately). Signal jacks To run units synchronousely, connect FL-OIC controller to the strobe light using a '/4" mono cable, and use the second signal jack to connect to additional units using '/4" mono cables. Before opening unit covers, make sure that the unit is cool and not connected to power source. Remove the front lens by loosening the nuts located on either side of the lens. [. . . ] If you do touch the glass with bare hands, clean it with alcohol using a cotton ball or soft cloth. [. . . ]