As an alternative to early cell phone signal jammer, mobile phone wireless earphone jammers have completely surpassed the effect of only shielding mobile phone signals.
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Cheating methods in examination rooms are now endless, and they are no longer limited to using mobile phone text messages to cheat. New types of cheating devices: wireless headsets, text message erasers, text message pens, text message mobile phones, etc. They completely avoided the mobile phone frequency bands, and the traditional mobile phone signal jammers had no effect on them.