Bluetooth uses a technique called spread-spectrum frequency
hopping that makes it rare for more than one device to be
transmitting on the same frequency at the same time. In this
technique, a device will use randomly chosen frequencies
within a designated range, changing from one to another on a
regular basis. In the case of Bluetooth, the transmitters change
frequencies 1,600 times every second and it’s unlikely that
two transmitters will be on the same frequency at the same
time. This same technique minimizes the risk another
Bluetooth devices disrupt another Bluetooth network since any
interference on a particular frequency will last only a tiny
fraction of a second. [2]