Bluetooth is a wireless technology used to build personal area networks between fixed and mobile devices over short distances.
Bluetooth devices have two crucial parameters: class and supported profiles.
The term “class” denotes the maximum distance over which a Bluetooth connection may be made. A Class 2 device has a range of up to 10 metres, which is the majority of mobile devices. Class 1 devices are uncommon and can communicate up to 100 feet away.
Among Bluetooth connections, “profile” is one kind. The most popular profiles for connecting to a wireless headset or handsfree are Headset (HSP) and Handsfree (HFP).
Further profiles include A2DP, which adds support for stereo sound streaming, OBEX (OBject EXchange), which enables the transmission of files, contacts, and events, and AVRC, which enables playing to be controlled remotely.