Abstract: A portable device for communication is useable during movement by a person. Individual portable receivers (2), the size of a credit card, display and/or broadcast to a user, automatically or by selection, data coming via waves (3) coming from microwave or laser transmitters (1) and FM transmitters (4). The transmitters (1) can cover nerve zones such as population centers, and sequentially send a flow of data transmitted by a digital signal with for instance 900,000 bits/second. At the same time, the transmitters (4) are used to cover 95% of a territory in audio. This provides a service of public interest, allows changing the descriptive speech, provides a choice of messages, offers a presale service, and makes possible selective identification.