THANKS TO THE PARACLIPSE PATENTED AUTO-ADVANCING CARTRIDGE SYSTEM MESSY AND UNSANITARY GLUE BOARDS ARE A THING OF THE PAST EASILY AND SAFELY ELIMINATE THE FLIES IN YOUR FACILITY WITH PARACLIPSE RELYING ON THE ULTRA-VIOLET LIGHT AND REPLACEABLE CARTRIDGES USED IN ITS SYSTEM. THIS CARTRIDGE CONTAINS A RIBBON THAT IS POWERED BY A SMALL MOTOR WHICH MOVES THE GLUE SURFACE SLIGHTLY EACH DAY KEEPING FRESH GLUE AND ATTRACTANTS THROUGHOUT A 30-DAY PERIOD ALLOWING IT TO TRAP UP TO 1000 FLIES. THIS ITEM ALSO HAS NO INSECTICIDES OR PESTICIDES MAKING IT USDA & FDA COMPLIANT.