The EDM4S or EDM4S SkyWiper (Electronic Drone Mitigation 4 - System), is a portable electronic warfare anti-drone device produced and developed by the Lithuanian company NT Service[1] It is designed to disrupt small and medium sized UAVs by jamming their communication and satellite navigation systems with an electromagnetic pulse.

[2][3] The device was first shown by the company NT Service (based in Kaunas, Lithuania) in the 2019 Security and Counter Terror Exhibition in London.

[1] In partnership with Israeli company Skylock, NT Service also produces the system under the name "Skybeam".

Depending on the UAV's level of autonomy, it may then fall out of the sky, make a controlled landing, return to an earlier waypoint, or continue operating normally.

[2][1] The EDM4S-UA version of the device – at a unit cost of US$15,000 – was first used by the Ukrainian Armed Forces against the Russian separatist drones in Donbas in 2021 as part of the Russo-Ukrainian War.