Flying insect bug zappe r uses 12V accessory plug. Keep your cooking area or car area free of flying insects with the Koolatron 12 Volt insect killer . Plug the Koolatron bug killer into your car or truck's cigarette lighter plug outlet. This 12V Insect Killer uses a UV light placed behind an electric grid to attract and electrocute flying insects. Traps like this are usually required in food preparation establishments.