Peltor Sport Tactical 300 Electronic Hearing Protector, 1/Pack The 3MT PeltorT Sport Tactical 300 has a targeted NRR of 24 dB for passive sound protection. Suppresses gunshot noise and amplifies low sounds using proprietary 3M technologies. Gunshot Recognition and Suppression Technology optimizes noise protection based on the firearm being used and the environment in which it\’s being used. Clear Voice Tracking Technology seeks voice amongst the noise to improve speech intelligibility and situational awareness. Engineered for optimal fit and comfort.