I guess I'm skeptical about devices, but I am 100% USDA grade-A bug bait. No lie - I attract any biting varmint for miles around. People stand next to me and I'm getting swarmed. I just put on Layers and have a bug mesh hat that has no-see-um size mesh and I can deal with it. Of course waiting until after a good cold snap moves through will also neutralize the bugs. I'd rather sweat a little than lose sleep scratching, so I'll layer and keep a barrier method betwixt me and the little SOB's!