Penicillin (counter-artillery system)
From Conservapedia
Penicillin or 1B75 Penicillin is a Russian acoustic-thermal counter-artillery system. The system is basically a giant microphone that detects and locates enemy artillery, mortars, MLRS, anti-aircraft or tactical-missile firing positions without emitting radar signals. It pinpoints enemy fire within 5 seconds at a range of 25 km.
