Yes such a device exist and it can protect you from being trace by GPS tracking device secretly installed somewhere around you such as your car. Let say you rent a luxury car or stole someone’s car LOL, and you don’t want to risk the vehicle might have lojack or GPS tracking system tracking where you at, you can use this so call GPS tracking device blocker or jammer. It basically blocked any GPS tracking signal being transmitted within 10-15meters around you 🙂 cool huh! and the device cost about $20, it’s not that expensive. I don’t encourage you to go steal cars or cheat rental car company tracking you down, but this device can be use as safety measure let say protecting  yourself from spy tracking where you go and so on, have a little fun, when you want to disappear just plug it in and the tracker probably think you still at that same location LOL

GPS tracking blocker jammer probably can jam cellular signal also including cell phone wifi devices within 15meters or so

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