http://www.squidoo.com/best-tennis-racket-bug-zappers
I found out that it hurts, so not gonna try it
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There are many different models of these bug zapping tennis rackets but most use a battery of some description in the handle to generate a high voltage electrical current along the racket's wire mesh. Simply swing while holding in the zap button.
These bug zappers aren't toys and they will hurt if you touch them while they are live but they hurt pesky insects a lot more.
Not to be understated is the amount of fun to be had with these bug zappers. The first time you hear that satisfying 'crack' when you swing and hit a large mosquito you are going to be hooked. It's likely that after that first time you are going to go out and find the most bug infested places you can to have your next barbecue.
Besides the fun to be had with these products an important benefit is that they can do their job of ridding you of pests without the need for any chemical pesticides. Great for use around young ones for this reason and you can even kill insects near the open flame of a campfire, something you could never do with a spray.