I have a little gadget that goes over the fly, or spider or whatever insect you are trying to dispose of, the lid closes and then you go outside, open the lid and set them free - you don't have to touch anything it is all automatic. When trying to catch a fly you have to wait until they settle and then remember that they take off backwards so you have to allow for that. Flies carry germs and they are disgusting creatures. Spiders kill them and eat them so they are really good although they make me shudder.