Bluetooth technology actually has many "categories", that is, different versions of the core specification. At present, the most common technologies are Bluetooth BR/EDR (basic rate/enhanced data rate) and Bluetooth low energy consumption. Bluetooth BR/EDR is mainly used in Bluetooth version 2.0/2. 1, and is generally used in speakers, headphones and other products.
Low-power Bluetooth technology is mainly used in Bluetooth version 4.0/4.14.2, mainly used in the latest products on the market, such as bracelets, smart home devices, automotive electronics, medical devices, beacon sensors (small transmitters that send data through Bluetooth technology) and so on.
Extended data
A Bluetooth master device can communicate with at most seven devices in a piconet (a temporary computer network using Bluetooth technology), although not all devices can reach this maximum. Devices can change roles through protocols, and slave devices can also be changed into master devices (for example, headphones initiate a connection request to a mobile phone. Naturally, the master device is the initiator of the connection, but it may run as a slave device later. )
Bluetooth core specification provides two or more piconet connections to form a distributed network, so that specific devices can automatically play the roles of master and slave respectively in these piconets.