As the name suggests, it is used for wireless charging. There's a coil in there that acts as a receiver. Stick the patch on the back of the phone and plug it into the phone's charging port. When using, put the whole phone on the wireless charging transmitter, it is OK, pay attention to the position to be good, because the transmitting coil and the receiving coil are relatively small, need to be aligned to charge. The need for alignment, the charging distance is very close, which is a common problem of such mobile phone wireless charging products on the market, because the QI technology used is a tightly coupled technology.
At present, the recognized development direction is A4WP wireless charging technology, which is loosely coupled technology, charging area and charging distance can be increased by more than ten times, Intel, Qualcomm, Mediatek, domestic BYD, micro goose technology are doing research in this direction, I believe there will be products available soon.