Bluetooth

Which is widely used was named after a king “Danish King Harald Bluetooth” who belongs to 10th century. The name is given because King Bluetooth had been influential in uniting Scandinavian Europe during an era when the region was torn apart by wars and feuding clans. And now it is a secure, low-power, low-cost, globally available radio frequency. The main feature of this device is that it does not need any service provider or some mediator for accessing. Bluetooth uses a radio technology called as frequency hopping spread spectrum. This chops up the data being sent and transmits chunks of it on up to 75 different frequencies. The modulation used in blue tooth is Gaussian frequency shift keying. The Bluetooth specifications are developed and licensed by a origination called as Bluetooth Special Interest Group (SIG).