What can Bluetooth do?

I want to correct the explanation upstairs. Bluetooth is indeed the name of the Danish king, but the historical situation is that he unified all the small countries nearby at that time. Later generations called this technology Bluetooth, which is also a symbol. Bluetooth can also connect the same devices nearby through wireless networks. Call can transmit files or wireless data, but remember, it will cause great interference to the signal near the microwave oven, and it will also have great influence near some medical equipment. In addition, Bluetooth transmission must have Bluetooth in both devices, such as mobile phones, MP3 players (Samsung's MP3 players), notebooks, printers and so on.