How likely are thieves to use Wifi jammers? How do wifi jammers interfere with wifi?

I've been worried about thieves bringing wifi jammers into my home for jamming monitoring. is it possible?

Topsignaljammer  2022.3

Whether it is a large signal jammer device or a small signal shielding device, its principle is to interfere with the mobile phone to receive the normal frequency sent by the base station through its own frequency, so that the mobile phone cannot contact the base station, so as to achieve the purpose of shielding. 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.