How does bluetooth actually work?
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Bluetooth is a standard for mobile, short range, wireless networks. It establishes devices such as your phone to operate and manage the network and devices to provide services to this manager — things like headphones.
Because it is mobile, there is the possibility of interference with other wireless communication systems. To prevent this, the frequency the Bluetooth network will change within a limited ranged in a process called frequency hoping to find a frequency that has the lowest interference.
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