Abstract: A communication device is presented that includes a receiver operatively coupled to a processor. The receiver receives communication data from other communication devices. The device also includes a speaker operatively coupled to the processor. The speaker is configured to output a sound wave based on an output from the processor. The processor determines a distance from another communication device transmitting communication data to the communication device. A volume of the sound wave is reduced in proportion to the distance between the communication device and the other device.

Abstract: A plurality of communication devices form a network, including a first communication device configured to send and receive communication data to and from other communication devices within the network using time division multiple access protocol; wherein the first communication device is configured to store data indicating whether another communication device is in a master state; wherein in advance of sending communication data, if another communication device is not in the master state, then the first communication device will enter the master state; wherein in advance of sending communication data, if another communication device is in the master state, then the first communication device will enter a lowest available time slot; and wherein all of the communication devices in the network synchronize to the communication device in the master state. Other embodiments are also included herein.