Cell phone jammer is a very interesting device that allows people around you can not use the phone calls and Internet access. We know that some places have a cell phone jammer for sale, if you are interested can look at.
I can not admit that sometimes you have to use illegal means to prevent the use of some signals, similar to the invigilator in the examination room, this time we need to use a Cell Phone Blocker
In the prison cell phone signal jammer can be used to effectively control the offender contact with outsiders, so in these places use the phone jammers are legal.
Knowledge:Cell Phone Signal Jammer can block 2G 3G 4G mobile phone signals are used, worldwide mobile phone signals can be found in the corresponding device.
Signal jamming mainly includes mobile phone signal jammers, GPS jammers, WIFI jammer, Bluetooth jammers, etc.
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gps jammer can support multi-band signal shielding, and some GPS JAMMER can shield mobile phone signals.