There will definitely be radiation, but there is no evidence that it will cause harm to the body without current charging in the air. Relationship between radiation standard and space area. According to the upper limit of safety set by the International Committee for Non-ionizing Radiation Research, the safe radiation range that human body can bear is 10W/m2. According to the calculation of 90 square meters family residence, the maximum radiation power that residents can bear at home is about 900 watts. According to the maximum emission power, the charging pile is only 25 watts, which can ensure sufficient safety. However, individuals have objections to family radiation, and many families have an area of less than 90 square meters. And each room is separate, so it can't be counted together. Space charging is millimeter wave. Millimeter waves are extremely narrow beams transmitted to mobile phones. At present, there is no experimental data showing that millimeter waves will bring radiation. That is to say, millimeter wave radiation will not have adverse effects on human body. In fact, there will be electromagnetic radiation, which is generally not very large, similar to WiFi. Do neighbors steal electricity? As for whether it will be stolen by next-door neighbors, it is unlikely at present, because there is a wall, and infiltration will definitely not work. Because of the long distance, the inflation loss is also great. "The loss of wireless charging is much higher than that of wired charging. This loss once reached 30%. If you charge at a long distance, there will be greater loss, more use and greater energy waste. " (2) Some time ago, Xiaomi released the technology of charging in the air, and simultaneously released the demonstration video. Once unveiled, air charging, a new technology, stirred up a thousand waves with one stone. Many netizens commented and exclaimed: "Is the sci-fi era really coming?" After the official inquiry about Xiaomi. In response to questions such as air charging radiation and whether it will be stolen, the reporter contacted Xiaomi, and the other party responded that because it is still in the pre-research stage, the specific situation is not convenient to disclose. "But what is certain is that it will be safe after commercialization." Principle of long-distance charging. It is the millimeter wave emitted from a distance through the charging pile that generates current in the wireless charging coil of the mobile phone, thus charging the mobile phone. The difficulty of long-distance charging lies in the positioning of mobile phone and the directivity of millimeter wave. The first is the positioning of the mobile phone indoors. If you want to charge in the air, you must know the location of the mobile phone accurately, which requires very high accuracy. Higher precision will enable millimeter waves to be transmitted to mobile phones more accurately. The second is how to transmit millimeter wave to the wireless charging coil of mobile phone.