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How to block Wifi in the office area

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There is WIFI in the office area of my company. As a result, many employees connect to WIFI in the toilet and do not return to the office area for a long time. So, I want to know if there is a way to block this WIFI signal?
Hello, Norma
The easiest way to do this is to turn off your wi-fi router by night. Of course, if is not convenient to shut down the router and the other methods. For example, use a WIFI signal jammer.
Such devices can generate a signal shielding space within a certain range. It can isolate all WIFI signals. Make sure your child doesn't have access to WIFI and doesn't interfere with others
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