The wireless network facilitates people's access to the Internet, but the problems caused by it cannot be ignored. This is not only a problem of accessing the network, but also a problem of network security. In order to maintain a good network environment, many places have installed wifi shields to prevent excessive use of the network. This equipment has been widely used in countries and regions around the world. Schools, prisons, libraries, reading rooms and gas stations are typical representatives.
https://www.dojammer.com/wirel....ess-wifi-blockers.ht
