Founded in 2010, guangzhou city's fai communications technology ltd. Has been focusing for 13 years on the production, development and installation of an electro-magnetic shielding device. It is one of the largest specialized producers in guangdong province. It is one of the main producers of such devices. It is now widely used in communications networks, data centre rooms, smart city construction, state secret government bodies, public security offices, aviation, space, nuclear industry, and military engineering。