A wireless communication device with a holder configured to be attached to a helmet strap, comprising: a speaker contained in a first flattened housing which defines a main internal face, associated with the speaker and intended to face a user ear, a main external face , and a perimeter connecting a perimeter area of the main internal face and of the main external face; a microphone, wherein the microphone is contained in a second housing connected to and distanced from the first housing by a rigid or deformable duct ; a battery and an antenna are connected to the speaker and the microphone and are contained in said first and/or second housing ; characterised in that the holder includes a first anchorage , facing the main external face of the first housing and including several elastically deformable legs arranged around the perimeter of the first housing , said legs attaching the first anchorage to the perimeter of the first housing , the holder further includes a second anchorage , adjacent to and attached to the first anchorage , intended to be fixed to the helmet strap; and wherein the perimeter of the first housing is shaped as a regular polygon with at least six faces and the elastically deformable legs are configured to undergo deformation when the first housing with a polygonal perimeter rotates with respect to the first anchorage , but without releasing the first housing during said deformation; or the perimeter of the first housing is circular and the elastically deformable legs of the first anchorage are configured for exerting elastic pressure on said perimeter of the first housing , hindering the free rotation thereof; enabling the first housing to be positioned at different angular positions to the first anchorage . a speaker contained in a first flattened housing which defines a main internal face, associated with the speaker and intended to face a user ear, a main external face , and a perimeter connecting a perimeter area of the main internal face and of the main external face; a microphone, wherein the microphone is contained in a second housing connected to and distanced from the first housing by a rigid or deformable duct ; a battery and an antenna are connected to the speaker and the microphone and are contained in said first and/or second housing ; characterised in that the holder includes a first anchorage , facing the main external face of the first housing and including several elastically deformable legs arranged around the perimeter of the first housing , said legs attaching the first anchorage to the perimeter of the first housing , the holder further includes a second anchorage , adjacent to and attached to the first anchorage , intended to be fixed to the helmet strap; and wherein the perimeter of the first housing is shaped as a regular polygon with at least six faces and the elastically deformable legs are configured to undergo deformation when the first housing with a polygonal perimeter rotates with respect to the first anchorage , but without releasing the first housing during said deformation; or the perimeter of the first housing is circular and the elastically deformable legs of the first anchorage are configured for exerting elastic pressure on said perimeter of the first housing , hindering the free rotation thereof; enabling the first housing to be positioned at different angular positions to the first anchorage . <EOS>