Since GPS system has been set up, it really help us a lot. Base on the GPS system,we have developed many devices to help us in military use and in our lives. But the GPS system also has a very dangerous threat to us,it could easy expose our locations. Anyone could easily track down our locations by putting a small GPS device in our cars or even in our pockets. To protect us from the danger of being illegally tracked down, we need GPS jammer. GPS jammer is a kind of electronic anti GPS devices, it could issue a stronger signal to cover GPS signal in the same frequency as GPS signal. Because this signal issued by GPS jammer stronger than the GPS signal, it could cover and hide the GPS signal, so all GPS devices in a certain area could not receive the GPS signal, thus can not work properly.

GPS devices are more and more popular around us in our lives, so as GPS jammers. GPS devices are very convient to use, which causes a fatal threat, it could easily be used by bad guys to track us down. That is why we developed the GPS jammer----we need a safe and convenient way to protect us. This kind of GPS jammer could be used any where, once we turn it on, it start to issue stronger signal, all GPS devices will be out of service. But when we turn it off, all GPS devices will come back to work again. The GPS jammer would not cause any harm to any electronice devices as well as human healthy.

There are many kinds of GPS jammers. According to the convenience of use, we have portal GPS blocker and desktop GPS jammer. Portal GPS jammer is small in size, and it use rechargable batteries, could be put in pocket or a bag to carry any where. It could be use in different places. Desktop GPS jammer is bigger in size, stronger in power, it use AC adaptor or car adaptor, it could cover longer distance. But because is is bigger and it could not use rechargable batteries, it could be used in a fix place only.

According to the functions, we have single function GPS jammer and multi functions GPS jammer. The former one has only single function, it could block GPS signal only. The latter one has one or more other functions besides of the GPS functions. Besides of jamming the GPS signal, it could also blocke other one or more singals, like cell phone signal, wifi signal, RF signal, UHF/VHF signal, bluetooth signal, radio signal, wireless video signal and so on.

According to the power of GPS jammer, we have low power GPS jammer and high power GPS jammer. Low power GPS jammer could cover small place, while high power GPS jammer could cover bigger places. Low power GPS jammers normally are portable GPS jammers, high power GPS jammers are desktop GPS jammers practically.

To select a suitable GPS signal jammer, we should first consider where to use it, how big place it is. Remember that high power GPS jammer could affect a bigger place. Second we shuld consider is, we use it in a fix place or different places. To use in a fix place we need desktop GPS jammer, but if we need to use it in different places, we need a portable GPS jammer. Third, we should also consider what kind of funcitons we want. If we need to block GPS signal only, we need a single function GPS jammer. But if we need to block other signals besides of GPS signal, we need multi function GPS jammer. Next, we should consider the budget, how much price we want to pay for it. Portable and low power GPS jammers are cheaper, while desktop and higher power GPS jammers are more expensive. Multi function GPS jammers are expensive also, because it offer more functions.