How Bluetooth works?

Bluetooth is a wireless technology standard for exchanging data over short distance of upto 10 m between mobile phones,smart phones,laptops,tabs etc. It was invented in 1994 by telecom vendor Ericsson. IEEE standarized bluetooth as IEEE 802.15.1and it is a type of Personal Area Network. Bluetooth uses frequency range from 2.4 GHz to 2.485 GHz. This frequency range has 79 channels each of 1 MHz.

Bluetooth devices automatically detect and connect to another device & at the same time upto eight devices can be connected each using a seperate channel out of 79 available channels. Don't worry about the interfacing of bluetooth with any other electrical device because it has two reasons that avoids interfacing :-

a). Bluetooth operates at very low power and your device transmitter won't carry signal far than about 10 m.Because of this short range transmission,bluetooth is more secure than Wi-fi.

b). To minimize interfence & to provide secure transmission, bluetooth devices constantly change the channel they are using out of 79 available channels. The rate of shifting of channels is about thousands of time per second.