WiFi Deauthers vs Signal Jammers

The Theory behind WiFi Jamming in the RF Spectrum

You might have seen several WiFi jamming devices on Chinese sites such as Aliexpress, Wish, or Alibaba.  However, Signal Jammers are very different from WiFi deauthers, since the first one creates a lot of signal interference in the RF spectrum while the other one basically injects forged frames to disconnect the WiFi clients from the WiFi router or access Point.

So what is a Jammer?

Image 1: Example of Signal Jammers

In a nutshell: A WiFi jammer is a device that creates a lot of random noise to prevent communication on a specific WiFi band or channel (imagine playing music so loud that nobody around could talk to each other). 

The theory behind signal jammers and their effectiveness in disrupting wireless networks is related to the nature of how WiFi devices talk to each other: Overall by listening to their assigned channel for any RF activity and if the RF medium is free for transmitting data then the devices may transmit their information (i.e., the listening before talking algorithm called CSMA/CA designed to avoid signal interference/collisions from two or more devices transmitting information at the same time).