We have plug in's that emit a high pitched noise that we can't hear but the mozzies can. Don't really get bothered with mozzies in the house, probably because of the screens Engin had fitted for us a couple of years ago. We have one of those ultra violet plug in lights that we use on the veranda, have to say it's very satisfying to listen the ping and know another little monsters has been fried We bought this in Lidl's but note they now sell them locally.