Electronic products such as bus cards, access control and mobile phones are often "demagnetized" because of mutual interference. 

"The scientific name of this film is 'wave-absorbing magnetic sheet'." Wang Peng introduced that if a "wave-absorbing magnetic sheet" is placed between the mobile phone, the access control card and the bus card, then opening the door or swiping the card will have no effect. 

The principle is that it can provide an effective path for the electromagnetic identification signal, preventing the signal from interacting with the lithium battery in the mobile phone and losing the identification function. In addition, the "wave-absorbing magnetic sheet" can also be used for contactless mobile payment, access control management, ticket management, point-to-point data transmission and other functions. 

Now many mobile phones with NFC (Near Field Communication Technology) function will have such a magnetic conductive material in it, which is very widely used. "Japan is at the forefront of the world in new materials, but their similar inventions are cumbersome, expensive, and not as technical as ours."