2018 US most popular cell phone signal jammer 3G 4G GPS

Today we will introduce the most popular jamming device in the United States in 2018. This is a hand-held cell phone jammer. It can jamming all cell phone signals, GPS signals, WiFi signals, Lojack signals. It has a jamming range of 40 meters and can be used in many situations. It is often used in libraries, cinemas and conference rooms. Source products: https://www.perfectjammer.com/handheld-8