My sister used the "OFF" brand fan device and says it worked for her. I think I'd prefer to carry one bottle of bug juice as opposed to a fan clippy thingy and extra batteries. In Panama, As an experiment, Special Forces had us using vitamin B complex in large doses to ward off mosquitoes. The key to this working is that you are sweating profusely from carrying a large pack and walking all day. Here's the kicker...it works fine, no mosquitoes came near us at all, it's because we had a body odder that was so bad we couldn't stand each other. You could actually smell my squad from a distance, not something you want when trying to be tactical and stay hidden. This was the last time we ever did this.