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Bluetooth devices do not simply broadcast blindly into the air- they have to establish a connection first. For that to happen the mouse must be "discoverable" and its receiver must be searching for it. After they find each other, they establish a specific channel to work on, and in the case of my cell phone and mouse must have some sort of confirmation that the connection is working- performing a specific action with the mouse or typing a message on a prompt with the cell phone.
Think of it as cell phones versus radios- the cell phone establishes a specific connection with the cell tower, whereas a radio broadcasts indiscriminately. Either one could be picked up by an outside party, but by and large the specific cell phone connections are ignored by uninvolved parties.
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