What is a wifi jammer?

A WiFi jammer might sound like something out of a movie, but someone might have one near you right now! Here’s what it is and why you might need one, too. Jammers are mainly used to render these devices useless and are being used by companies and individuals with increasing frequency. Today we’ll cover two of the most popular type of jammers that function for two unique purposes: WiFi jammers and drone jammers.
This jammer is effective if you are working with sensitive data away from work or your home, like a hotel or some other more public space. With up to two hours of battery life on full charge, it’s also ideal for people who feel more comfortable with a bit of a barrier between themselves and other people’s devices.
Actually, wifi jammers are not illegal, as long as you make it clear that you are using on in a given area. Theaters often use them, so performances are not interrupted. WiFi is rather unreliable signal you know. For example two wifi routers that operate in the same area can cause loss of any wifi signals at all because they will be "jamming" one another. That's why modern wifi routers have built-in autoadjustment of the frequencies so if some frequency is already in use, router starts to use a slightly different frequency.
Why use this signal jammer?
One of the schools I used to work for had a small jammers that would jam Wifi and GSM/3G signal. They used to let us use them in our classes. It was always funny watching students trying to figure out why their phones weren't working. I think they should be installed in movie theatres and they also work pretty well when it comes to drones if you are close enough.One of Britain's top cops has come up with an unconventional solution for dealing with pesky teenage hackers: Make them wear portable Wi-Fi jammers. Jammers disrupt by overwhelming a device with useless signals — so this can be obstructed. A Faraday cage is able to block signals to and from to a smartphone, so building a DIY one around the tag would stop the jammer working.
The only way to do it without affecting the WiFi and/or cellular in the areas around the bathrooms is a wifi jammer. After spending that money, people will still be able to play on their phones without data, read a book or rub one out. That is the only technological solution that will work.