It should be a thin metal shield, which is completely effective. Simple test method, put the mobile phone in, and after dialing, it is heard that it is out of service or turned off, which shows that it is completely effective.

It is necessary to buy yourself a wallet with an anti-theft brush. After all, it is our wallet that knows our information and property best. At the end of the lunar calendar, many people's backpacks were unfortunately scratched and their wallets were stolen. Although you can guard against theft, you should be careful to prevent thieves from stealing the whole wallet at once. Many people remember to put their bags in front.

Radio Frequency Identification (RFID)

RFID is the abbreviation of radio frequency identification, and its scientific name is translated into radio frequency identification technology. This is a non-contact automatic identification technology, which identifies the target through radio signals, thus obtaining relevant data, and this process can be realized without the contact between the identification system and the identified target.

For example, bus cards, second-generation ID cards and credit cards used in our daily life all use RFID technology. On the one hand, this technology greatly improves the convenience of information exchange. For example, if we take the bus, isn't it a waste of time to insert the card and then pull it out? Now you can brush with a light touch, which is the application of RFID technology.

But everything has two sides, which of course has a bad side. With this technology, it is easier for many criminals to steal our information or property through some hacking techniques or equipment. Once cracked, they can be stolen remotely. Everything will have a solution. Now many big brands have developed anti-theft brushes and wallets that shield RFID signals.