I have had this product sitting on my patio table for two days now and it hasen't trapped a single fly. It does seem to attract them though. I have seen two or three flys walking on the lid while two or three of them are landing on me. They walk in the holes on top and walk right out. I am very disappointed in this product and would not recommend it. I will try to return it to Home Depot where I bought it and look for something else.