https://www.jammermfg.com/cell-phone-jammers.html This DJ-087 Cell jamming device is a professional high-performance 4G Cell phone isolator, at the same time, it is also a WiFi GPS signal blocker. It has 8 high-gain antennas and 7 cooling fans, which bring us strong interference ability and quickly take away excess heat, without worrying about overheating, and easily achieve 24h/7 continuous work. The most powerful is that its jamming distance can be as high as 150M, and it can also defend against drones within a range of 500M.https://www.jammermfg.com/professional-high-performance-4g-cellular-signal-blocker-with-8-bands.html