What does the jammer do on Prison Road?

The prison uses jammers to block inmates from communicating

We humans face a major problem, which is to avoid excessive obsession with mobile phones. It is unwise to spend too much time on mobile phones. The most terrifying statement is that mobile phones are likely to cause cancer. Everyone knows that taking an exam requires the test site to be absolutely quiet and ensure that there is no noise from the mobile phone, which means that anyone who takes the test is not allowed to use a mobile phone or other communication tools to communicate with the outside world. In this case, a cell phone jammer is essential for the test site.

http://www.jammer-buy.com/cell-phone-jammer/c-24.html

A portable gps jammer can be placed in your pocket for use anywhere. Professional GPS jammers are bigger and can be used in homes, offices, or some large factories, and can still be used in cars.There are many types of GPS jammers in our store. Some are portable jammers that can be carried around. Some combine GPS, mobile phones, and WiFi interference bands. If you only want to block GPS signals, you can choose a mini GPS jammer, and if you want to block the WiFi signal of your phone at the same time, you can choose a WiFi jammer.

http://www.jammer-buy.com/gps-jammer/c-25.html

We all like to use WiFi, it is a faster and faster wireless connection, and it is very convenient. We can walk around the house while keeping our phones and computers connected to a high-quality internet. All of this can be done in wireless mode, which is very good for all of us. But at the same time, we put ourselves at risk, so we must also use wifi jammer. After special adjustment, GSM, GPS, WiFi frequency band, etc. It can interfere with mobile phone signals within a working radius of 40 meters, including WiFi Bluetooth band! Moreover, its appearance is golden and very popular.

http://www.jammer-buy.com/wifi-jammer/c-29.html