But before we get to the radiation from wireless networking products, I want to talk about the radiation from cell phones. Nowadays, many people use cell phones every day, and we don't hear much about the fear of cell phone radiation and the call to use it as little as possible, but we may have forgotten that a few years ago, there was a news story that caused a strong debate in China - a newsletter about a medical organization that said that cell phone radiation can easily lead to brain cancer. The news was about a medical organization's claim that cell phone radiation could lead to brain cancer. In fact, the radiation of a cell phone is far less than that of a microwave oven, but why is it that people don't worry so much about microwave ovens, but are so concerned when using cell phones? It is very simple, because the phone next to your head and microwave oven in the kitchen, so to talk about the radiation problem should also consider the use of the product: wireless networking products are generally placed on the ground at work, will not be close to the human body, so if it does not have a very strong signal transmission power, is not harmful to the human body.