Wireless charging uses the principle of electromagnetic induction, which operates at a very low frequency and does little harm. If you are still worried, you can choose a shielded scheme. This one is the instruction manual of a typical mobile phone wireless rechargeable battery with a shielding scheme: Universal mobile phone wireless charger - Usage instructions This mobile phone wireless charger is the most advanced technology in the world, rich in micro-volume - large current - micro-temperature rise - metal resistance - do not misoperate and other advanced technical indicators, only it can set many essence in one and successfully placed inside the battery, can easily turn a variety of different brands of mobile phones into wireless charging mobile phones instantly, And has a strong anti-interference ability, any other items such as electromagnets, metals, etc. will not cause misaction on the launch board, and has a perfect launch, receive fault self-check function, super communication between the transmission and receiving function, the launch board can accurately identify the various working states of the battery charging, and accurately indicate it, and adjust the launch current in time. The launching plate is provided with the overcurrent protection function of the battery; At present, mobile phone wireless chargers on the market, whether domestic or foreign, due to technical limitations, their fatal weakness is: The volume is huge, the protection measures are not perfect, most of them can only be stopped in the initial stage such as adding the jacket and the back shell, which is extremely inconvenient to use, so it can not be used in large numbers, and it is easy to cause unsafe heat to mobile phone metal objects, batteries, etc. Let everyone's long-awaited wireless charger can finally be widely used in mobile phones of various brands of high and low grade mobile phones so that the popularity of wireless charging can be easily realized, the same launch board is all compatible with a variety of different brands and models of mobile phones, so that the new technology completely changes life! Transmitter board parameters * Power supply voltage: 12V* Power supply current: maximum working current limit 350mA* Standby working current: about 20mA* Non-supporting modules (batteries) will not work * Any metal objects will not work on the transmitter board * Any other objects will not misoperate * Super self-check function: When the output voltage of the transmitter board is incorrect or faulty, the traffic light is on at the same time and the work will stop automatically. Due to the assembly error or failure of the receiver board, the work will stop. * All the batteries used are high-quality A product batteries, and the electronic devices used are the best devices * The battery accepts the maximum limited current of 500mA, and the charging speed is almost the same as that of direct charge * Wireless charging is realized without adding a set * Automatic shutdown after full * If the fully charged battery is put on the launch board, the red light will flash