http://www.jammer-buy.com/gps-jammer/c-25.html
The GPS signal jammer radio wave suppressor is the most suitable item for selling vehicles. Can prevent GPS fault! Don't worry about being followed by someone. Don't worryThe basic principle of the radio jammer is in the operation process, the portable jammer is scanning the lower communication frequency of the previous communication channel at the constant speed to the high end scan. When you receive a text message on a mobile phone, the scan rate can be scrambled and blocked, while the smartphone's jammer cannot check the normal data sent from the base station. In addition, mobile phones will not be able to connect to base stations within a certain range.

This is a high power design, so no problem. We use * in many stores and company facilities * you can minimize blind spots by combining the size of the local units you use. If you calculate the interference area of the radio wave interference area and install it on every floor and so on, we think it is relatively cheap.

http://www.jammer-buy.com/portable-jammer/c-36.html
Mobile phone performance network, no signal, no service system, no further use, no use. However, when the mobile platform is out of the barrier, it can be used normally. The launch of the electrical signal from a portable jammer is undoubtedly a kind of electromagnetic signals, but in the GPS jamming specialist shops, the barrier does not handle any equipment and data processing, so can't form changes have a bird's eye view of the signal.
In other words, the leaf change signal remains in a relatively static state, which does not interfere with other electrical facilities and is harmless to the human body. This is a popular GPS radio interceptor! All GPS/L1 and L5 can be blocked!