Mosquito Zappers and Insect Zappers have been around for a long time. These Zappers attracts flying insects that get attracted to the warm light and then are electrocuted when they touch the electrical grid. Hence the name Zappers has been loosely associated with these products due to the sound they make when they kill the insects. Pestrol sells a range of Insect Zappers, from plug-in units to portable mosquito zapping lanterns.