While today's bug zappers may not be terribly different from their predecessors in terms of operation, they have become more energy efficient with the inventions of LED bulbs and rechargeable batteries. Of course, solar-powered models are the most energy efficient of them all.
BATTOP Solar bug zapper is equipped with four LED emit lights which are 1.9 X 3.9 inch in size. They attract mosquitoes, flies, bugs and other flying insects very efficiently. When the solar powered bug zapper has lured the insects in, it kills them very fast with human safe voltage.