Regardless of whether you use the phone jammer , it will be a very interesting product.
GPS is a geographic positioning system, it's there to provide a lot of convenience, but not everyone needs to be chased, so the birth of GPS Jammer
Teachers in the school have the right to use Signal Jammer, so we can not use the phone when the class, this is too make people mad.
Try this product, it is very good,Signal Jammer
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