Bluetooth is a short-range wireless technology standard that is used for exchanging data between fixed and mobile devices over short distances and building personal area networks. In the most widely used mode, transmission power is limited to 2.5 milliwatts, giving it a very short range of up to 10 metres. This is normally generated from a smart phone which has its own forms of security like eye recognition as well a fingerprint or a password or pattern to unlock the keypad of the phone . To allow access to apps on the phone that generates the bluetooth app to work .Better know as a smart key as well .

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