Original Red Top catches thousands of flies. Flies are attracted by the smell and once inside, they can no longer fly out and die. Non-toxic bait is activated by sunlight, so with heat flies increase and the trap works best. Place it about 15 metres away from the area to be protected. The trap will attract flies away from home, stables, kennels, and so on - bait works for at least 12 weeks. After use, throw away and replace. Professional quality fly bag for the capture of houseflies, bluebottles & greenbottles. Perfect for gardens, paddocks, farms and industrial sites; the fly killer bag will quickly start to trap flies.