Penicillin or 1B75 Penicillin is an acoustic-thermal artillery-reconnaissance system developed by Ruselectronics for the Russian Armed Forces. The system aims to detect and locate enemy artillery, mortars, MLRs, and anti-aircraft or tactical-missile firing positions with seismic and acoustic sensors without emitting any radio waves. It locates enemy fire within 5 seconds at a range of 25 km. Penicillin completed state trials in December 2018 and entered combat duty in 2020.