Attracts and Kills Flying Insect Pests The Flowtron FC4700 Indoor Bug Zapper is an effective indoor fly zapper designed to control flies and other light-sensitive flying insect pests. The low voltage grid of the mosquito zapper & insect zapper stuns insects and directs their flight downward onto the replaceable, hidden, no-escape adhesive board. Ideal for indoor spaces where fly management is essential.