The second is Cigarette Packet Cell Phone Blocker, which can only interfere with the recording of some Android phones. Recording on a high-end iPhone is basically useless, because the iPhone has an anti-interference system that cannot be shielded. This happened to me at first too. So after several attempts, I gained some experience and straightened the four interference heads on the cell phone jammer to form the effect of one plus one greater than two. This has to be tested repeatedly and fixed with glue after the test is successful. At present, they are all ultrasonic recording jammers, which have no effect on the resident microphone. Most of Apple's mobile phones use this recording format, so you can only choose the low frequency of the mobile phone jammer to interfere with the recording of the iPhone, and place the mobile phone jammer for transmission. Head position is also important. Try back and forth for the best masked recording.
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