Certifications: TÜV is a controlling authority which certifies various types of products, according to their construction compliance, in accordance with the applicable safety standards and regulations; If the product reflects all the necessary and requested features, the GS certificate (from German GeprüfteSicherheit, which means "controlled security") is issued. This brand, created in 1977, basically attests the conformity of the product, that receives it, with the regulations that protect and safeguard the user from possible injuries. In 1999, the controls were extended by the DIN 7926, also to the combination of the new EN 1176 and EN 1177, and then from 2000 onwards only to the latter. In order to be able to boast the TÜV brand, which is voluntary and thus represents an added value both to the manufacturer and to the product, compliance with specific and rigid test protocols are required, as well as the promotion of the periodic tests/controls to which the manufacturer and their products are subjected. The GS logo is valid for 5 years, after which the product has to be verified once again in order to receive a new certification. The brand guarantees that the item has been carefully evaluated in all its aspects (safety, toxicity, flammability, etc.), ensuring the functionality stated by the manufacturer and the maintenance of its characteristics over time, and also - almost by definition - excluding products with poor technical content or whose credibility is unreliable.