A Ukrainian company has expanded its FENEK acoustic detection system to identify Shahed-type drones at ranges up to three kilometers and cruise missiles at up to five kilometers, according to Militarniy.

The FENEK system, developed by a Ukrainian manufacturer, operates on a principle that has become increasingly relevant as the war has driven both sides to develop countermeasures against each other’s electronic detection capabilities: it only listens. The system emits nothing — no radar signal, no radio frequency emissions, no electronic output that electronic warfare systems can detect, locate, or suppress.