A wear tip for a rotary mineral breaker comprises a carrier 12 having at least one wear edge 40 having a recess 50. The surface of the semiconductor is first coated with a protective layer, which is later thinned to selectively reveal portions of the protruding defects. The external communication devices include at least one management communication device that communicates with the service processor. The invention also provides cables containing such a nanocomposite, preferably in their sheath or outer coating. The recipient can also prevent voice data from being delivered by selecting an answer mode of operation of the recipient’s device that enables the recipient to approve senders before voice data is transmitted. The higher the probability that a frequency is used for a given connection, as determined by the optimization, the more frequently a frequency is used in the hopping sequence.