In summer, mosquitoes are rampant all over the world. Mosquito swatches have become a hot product for killing mosquitoes because of their practical, convenient, safe and pollution-free advantages. Their powerful mosquito killing effect has won people's favor. Can mosquito swatters SWAT mosquitoes? In fact, mosquito swatter is not only a magic weapon to kill mosquitoes, but also a magic weapon to kill flies.

　　"Working principle of mosquito swatter" clearly tells us: "the circuit of mosquito swatter is mainly composed of three parts: high frequency oscillation circuit, triple voltage rectifier circuit and high voltage electric shock network DW. When the power switch sb is pressed, the high-frequency oscillator composed of the triode VT and the transformer T is powered on to work. The 3V DC is turned into a high-frequency AC of about 18khz, which is boosted to about 800V by T (estimated discharge distance), and then raised to about 2500V by diode vd2-vd4 and capacitor C1-C3 triple voltage rectification, which is added to the metal mesh DW of mosquito swatter. When the mosquito and fly touch the high-voltage power grid, the insect will cause a short circuit of the power grid, that is to say, they will be killed by the current, electric arc, or corona. In this sentence, the word "mosquito and fly" directly indicates that the mosquito swatter kills mosquitoes and flies, and further indicates that the mosquito swatter is designed for mosquitoes and flies. In other words, the mosquito swatter is born to kill mosquitoes and flies.

　　We know that mosquito swatter can kill flies, so we can use mosquito swatter safely and boldly.