The Dronegun is a weapon with the ability to ground unmanned aircraft from up to 2 km away. It fires radio waves into the distance to confuse the aircraft’s control channels. It blasts the drone with electromagnetic noise at the same frequencies as video transmission and control communications. This will typically cause the drone to return to its take-off point, but the Dronegun blocks GPS, that forces the drone to land on the spot.
The Dronegun is not intended for civilian use. The company is not offering it in the US, other than to government agencies. You can check out it in action, in the promo video below.