What makes the dynazap different from the old fly swatter and other racket zappers,it is fully extendable up to 3-feet in length and has an articulating head that bends in multiple directions for hard-to-reach areas like walls and ceilings. It also folds compactly, perfect for portable, everyday use. Light-weight and easy to use, the dynazap is the highest quality, most innovative racket zapper you will find.the dynazap is effective, easy, and fun. It kills mosquitoes, flies, gnats, wasps, yellow jackets and other annoying insects on contact without leaving behind a smudge or smear to clean up. The dynazap is safe for indoor and outdoor use and has a safety switch that electrifies the zapping grid only when pushed "on". Two aa batteries are included upon purchase and are easy to replace.