Apparatus (10) for the diffusion of voice messages relating to sites, such as museums, parks, places of public interest etc., comprising one or more fixed transmitter units (12) each provided with respective electronic memorization members, in which a corresponding voice message is memorized and each suitable to transmit the respective voice message, wherein said respective voice message refers to the site in which the corresponding fixed transmitter unit (12) is disposed; and one or more mobile receiver units (14) each suitable to receive at least a voice message from a respective fixed transmitter unit (12). Each fixed transmitter unit (12) is pre-disposed so that the corresponding voice message is memorized in the respective electronic memorization members in compressed form. Each mobile receiver unit (14) is provided with decompression members (38) able to decompress the voice message received so as to obtain a message reproducible in a comprehensible and intelligible manner.
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