For this, a grouping of hardware and software is used to allow this communication to occur among the different types of devices. The data transmission is done via radio frequency, allowing a device to detect the other independent of their positions, provided they are within the limit of proximity. This means that a device with Bluetooth class 3 only able to communicate with another if the distance between them is less than 1 meter. In this case, the distance may seem useless, but it is enough to connect a headset to a cell phone hanging on the waist of a person. It is important to note, however, that different classes of devices can communicate without any problem, simply conforms to the one that has a smaller range.
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