As you can see, this is a black shell signal jammer, 5 with antenna, means that it can block more signal frequency type, one of the most commonly used GSM 3 g 4 g cell phone signals, such as wifi and GPS signals is certainly contain among them, there are seven kinds of signal shielding combination, can meet your different signal shielding requirements, such as wireless video camera, wireless alarm frequency, etc. Of course, this is just the shielding combination that customers often need. If there is no shielding signal combination that you need, you can contact us for customization.
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