Got flies? The Captivator Fly Trap is just what you need! The 2-quart trap is break-resistant and can hold up to 20,000 flies! Works great to help eliminate flies that are bothering your animals. For best results, the fly trap should be hung mid-level, outdoors only, on fences, animal shelters, outbuildings, and more. Each trap includes an insecticide-free patented formula that flies can’t resist. Fill the trap with water to the indicator line, then add the included attractant to the water. Outdoor use only.