The most effective bait on the market. The patented, non-poisonous bait in the (sold separately) lures flies into an inescapable trap, where they drown. The trap holds the liquid bait made of water and dehydrated food-grade products. Draws a broad range of fly species, including houseflies and blowflies, outperforming competitive products 20 to one. Safe for use around children and pets. Also environmentally safe. For outdoor use.