A method for establishing a communication link between a transmitter and a receiver for the purpose of relaying audio material derived from an existing source to a user desiring to remain unencumbered by the source apparatus comprises the steps of: placing the receiver unit into physical contact with...http://www.google.es/patents/US6519448?utm_source=gb-gplus-sharePatente US6519448 - Personal, self-programming, short-range transceiver system
Personal, self-programming, short-range transceiver system
