I always use the product OFF and it works wonders for me. It comes in spray or cream. Was watching a program on Discovery awhile back and it was stated that its the females that do all the biting and go for sweet smelling skins. They did a test on all product for mosquitos and the ones that are plugged in do not do a thing to keep them away, the electric zappers outside seem to kill only other bugs, as they took out all the dead bugs in the tray and only found 15% of them to me mosquitos. Test no. 3: putting two men at night time in a forest, one with OFF on the other without, well you can imagine who they went after. Mosquito rep. were said to be the best thing to use to avoid getting bitten.