Outer stainless steel net + inner aluminum net, high efficiency electric shock. It is safe, effective, good quality and durable. High voltage and power, able to produce powerful electric shock to eliminates flies, mosquitoes and other flying insects. Easy to use. Simply press the button and swing, once the flying insect touches the screen it will be instantly zapped. Easy to hold handle, light weight and convenient battery power allows you to use with ease. Fly repellent can be toxic and smell bad. With this swatter you can away from the toxic smell.