DroneDefender is a weapon specifically designed to target drones at a range of just 400 meters with radio waves forcing them to safe mode. The weapon emits a harmless cone of radio waves that obscures the GPS and control signals that drones normally receive. It can help us in numerous settings, from the White House lawn to bases and embassies overseas; from prisons and schools to historic sites. The sale of the DroneDefenders is limited to Government entities and is believed to be effective against all commercial drones in the United States”]
Source: https://securityaffairs.co/wordpress/41138/security/dronedefender-electromagnetic-gun.html