Bluetooth takes its name from Harald Bluetooth, a Viking and former King of Denmark who was renowned for his ability to help people communicate. It eliminates the need for wires between computers, printers, monitors, mobile phones, personal digital assistants, and other devices.

Bluetooth wireless technology takes advantage of the 2.4GHz frequency to make it globally compatible. The range of Bluetooth communications is approximately 30 feet, but the signal can permeate walls of a house or office unlike your remote's infrared. 

To use Bluetooth wireless technology, a device must be able to interpret certain Bluetooth profiles, which are definitions of possible applications and specify general behaviors that Bluetooth-enabled devices use to communicate with other Bluetooth devices. 

It starts from version 1.0 and right now it has 5.0 version,Which can double the speed (2 Mbit/s burst) at the expense of range, or up to fourfold the range at the expense of data rate, and eightfold the data broadcasting capacity of transmissions, by increasing the packet lengths. Bluetooth 5 adds functionality for connectionless services such as location-relevant navigation of low-energy Bluetooth connections.