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How to block gsm signal from phone

Watchhound is another electronic device from Berkeley Varitronics Systems. It is mounted on the wall and used to monitor the surrounding area for any type of cell phone activity. All calls made in the area are recorded, time stamped and can be used later in the analysis. It's also worth mentioning that this device can easily be camouflaged to look like the regular thermostat on the wall and work in secret.

Wolfhound is the simpler tracking device which can be used for portable detection of cell phone activity, cell phone location and position tracking. This authorized to use device can use your cell phone's voice, text and even data transfer to detect and track it. It also has a direction-finding antenna for better cell phone tracking. It comes with 2 different models: one is for US frequencies while the other is for Europe, Asia, Australia and New Zealand.

Wolfhound-Lite is the latest device in this series. It looks like a simple pager, has a pocket size, and works completely hands-free. It is used to detect nearby cell phone activity and inform its user about it. It has a 9V battery that can be removed and recharged, a nice OLED display and a carrying case.

As you can see, Berkeley Varitronics Systems has a lot of features to offer their potential customer which could be the one who would track your cell phone and detect your location. Their devices use GSM and sometimes GPS frequency bands for their work. So you should use GSM jammer to make sure that Berkeley Varitronics Systems devices will not harm you.