I bought this to deal with flies in a conservatory and it works to a point but is not dealing with them properly so still have to resort to spray. It gets the odd one or two with such a loud crack you can hear it at the other end of the house but when they hit they also bounce off so land on the floor and even the table rather than dropping into the collection tray. Worst thing is that it hasn't killed a wasp yet but very large bumble bees can get inside and I was mortified to find one frying on the lamp tube so have not turned it on since. For that reason I can only give it three stars and was even tempted to return it and spend the money on fly spray instead.