What is a wifi signal blocking device and what does it do?

What is the principle of WiFi signal interference? How does it work?

Topsignaljammer  2022.3

Now the standard cell phone blocker on the market can block all 2G/3G/4G mobile phone signals and 2.4G WIFI signals, while 5G WIFI signals are usually not included in its standard shielding. This does not mean that 5G WIFI will not be blocked, because the buyer will customize it according to the frequency of WIFI, that is to say, if you want to block 5G WIFI, you can add it to the original blocker. The principle of blocking WIFI is actually that the signal blocker will send out the corresponding frequency when it is working to interfere with the mobile phone to receive the normal frequency sent by the router, so that the mobile phone cannot connect with the router and cannot surf the Internet normally.