Wireless charging uses the principle of electromagnetic induction, its working frequency is very low, the general NOKIA implementation of the QI standard distance is about 1-2CM, harmless to the human body, will not degaussing bank cards and other.
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It is not popular because NOKIA uses wireless charging as a selling point, which leads to the dissatisfaction of other mobile phone manufacturers, because other mobile phone manufacturers do not configure wireless charging.
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Wireless charging using fragmented time charging, really convenient life, I am also a user.