Today we live in a high technology world, many high technology devices help us to live better. Amoung them is the GPS sysem. There are too many GPS devices around us in our daily lives, you may have no idea but it is a true thing that we have been spied all the time. To solve this problem and protect us, we need GPS jammer. The GPS devices give us convenient lives and help us a lot with its wide application. Technically, GPS system has free, open and dependable nature. It is more than 30 years since the GPS eystem was established, it has led to the development of thousands of applications, all these applications are affecting every aspect of our lives. Look around, the applications of GPS technology is everywhere, from construction, shipping containers, ATM's to wristwatches and bulldozers. If you look at it in a higher level, GPS boosts productivity across a wide range of the economy, the use of GPS system includes farming, mining, package delivery, surveying and logistical supply chain management. But everything has its shortcomings, GPS device is a good think no doubtly, it also can be a danger for all of us because it is too easy to expose our locations, which may be fatal in many situations. To solve this problem, we developed GPS jammer to protect us. The GPS jammer is also named as GPS blocker. GPS blocker is a kind of electronic anti GPS device used to block GPS signal, thus disable all GPS devices in a certain working range. It will not do any harm to any GPS device, also it is easy to use. When you turn on it, it will issue stronger singal to cover the GPS singal, all GPS devices will show NO SERVICE. But when you turn it off, all GPS devices will resume working again. There are many kinds of GPS jammers in our shop, some are professional jammers, some are portable jammers, some combine GPS jammer and cell phone jammers or wifi jammers together, but some are single GPS jammers. After charged, the portable GPS jammers could be put in pocket to use everywhere. The professional GPS jammer is bigger and could be used at home, office or car where have continued AC powder. Single GPS jammers and multifunctional GPS jammers are designed to meet different purposes. If you want to jam GPS signal only, a single GPS jammer will be a good choice. But if you want to block GPS signal and cell phone signal or wifi signal at the same times, you need to have a multifunctional GPS jammer. GPS signal jammer could be used inside of your car, in office, at home, and everywhere that you don't want you to be tracked. GPS jammers were initially created by the government, for military organizations and spy agencies. Uses include confusing the enemy on exact locations, or where the enemy GPS guided missiles or bombs will fall. GPS jammers have become popular with commercial drivers who object to their employers tracking their every move. Victims of domestic violence have also been known to use GPS jammers to stop themselves being found. A practical application would be a salesperson or delivery driver, that may wish to lunch outside their territory, or return home for a forgotten item, without having to do a lot of explaining due to GPS tracking on their vehicle. The range of most civilian GPS jammers is sufficient to cover even the largest of vehicles, giving the user a cloak of privacy. The most useful way is to cover our vehicles, so we won't be tracked illegally by bad guys. It is very good devices that could protect us and our family.