Bluetooth is a wireless technical standard, which can realize short-distance data exchange between fixed equipment, mobile equipment and personal area network of buildings (using UHF radio waves in ISM band of 2.4-2.485 GHz). Bluetooth technology was first invented by telecom giant Ericsson in 1994 as a substitute for RS232 data line. Bluetooth can connect multiple devices, which overcomes the problem of data synchronization. Today, Bluetooth is managed by Bluetooth Special Tinterest Group (SIG). The Bluetooth Technology Alliance has more than 25,000 member companies in the world, which are distributed in many fields such as telecommunications, computers, networks and consumer electronics. IEEE lists Bluetooth technology as IEEE802. 15. 1, but this standard is no longer maintained. Bluetooth Technology Alliance is responsible for supervising the development of Bluetooth profile, managing certification projects and maintaining trademark rights. The manufacturer's equipment must meet the standards of Bluetooth Technology Alliance before it can enter the market in the name of "Bluetooth equipment". Bluetooth technology has a set of patented networks that can be distributed to devices that meet the standards.
The word "Bluetooth" is the Scandinavian word Bl? tand/Bl？ Tann (that is, old Norwegian blát? Nn), which is the nickname of HaraldBluetooth, a king in the 10 century. He unified the disputed Danish tribes into a kingdom, and it is said that he also introduced Christianity. The idea of naming Bluetooth after this was first put forward by JimKardach in 1997, and Kardach developed a system that can make mobile phones communicate with computers. His inspiration comes from the historical novel The Relationship between Dragons written by Franz. Bengtsson described Vikings and HaraldBluetooth King, which means that Bluetooth will also unify communication protocols into global standards.