Sardinia the highest internet performances, such as fastest broadband connection in Italy. Sardinia is also the Italian region with the highest percentage (41%) of 4G LTE users. The Chinese multinational telecommunications equipment and systems companies ZTE and Huawei have development centers and innovation labs in Sardinia. Sardinia has become Europe's first region to fully adopt the new Digital Terrestrial Television broadcasting standard. From 1 November 2008 TV channels are broadcast only in digital. Sardinia has three international airports (Alghero-Fertilia/Riviera del Corallo Airport, Olbia-Costa Smeralda Airport and Cagliari-Elmas Airport) connected with the principal Italian cities and many European destinations, mainly in the
History of Sardinia the Abealzu-Filigosa and Monte Claro culture of the Chalcolithic period, developed in the island contemporaneously with the appearance of the megalithic phenomenon. The dolmens culture, around the end of the 3rd millennium BC, passed with other typical material aspects of Western Europe (e.g. Bell Beaker) through by the Sardinian coast even in Sicily. Prehistoric and Pre-nuragic monuments and constructions that characterise the Sardinian landscapes are the Domus de Janas (), the menhir and Statue menhir and the dolmens. Archeological cultures of Sardinia in the pre-Nuragic period: Bronze Age Sardinia is characterised by stone structures called nuraghes, of which there are