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Bluetooth devices sends out very weak signals of about 1 milliwatt, so it can avoid interfering with other systems.
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With the low power，a Bluetooth signal will be stopped by the walls in your house.
The technique of spread-spectrum frequency hopping can make it impossible for more than one device to be transmitting on the same frequency at the same time, so the devices connected by Bluetooth can’t interfere with one another.
A personal area network—PAN or piconet—is a computer network organized around an individual person.
There can’t be more than one piconet operating in the same room, because they will disrupt one another.
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