According to the Wuhan City Licensing Office, after completing the English listening test, the cell phone jammer can be turned on and work normally; After the test, the cell phone jammer may only be turned off after all candidates in the exam room have left the exam room. Cell phone jammer It can block signal reception for a period of time, giving us more time to rest.

https://www.dojammer.com/wirel....ess-wifi-blockers.ht