The 3M Peltor Sport Tactical 500 has a targeted NRR of 26 dB for passive sound protection. Suppresses gunshot noise and amplifies low sounds using proprietary 3M technologies. Dynamic Supression Time measures the energy in gunshot noise and automatically sets suppression time for reduced echoes and increased comfort. Clear Voice Tracking Technology seeks voice amongst the noise to improve speech intelligibility and situational awareness. Bluetooth Wireless Technology to seamlessly sync to mobile devices. Engineered for optimal fit and comfort. IDEAL FOR both indoor and outdoor shooters and hunters. BLUETOOTH WIRELESS TECHNOLOGY to stream music and make calls. DYNAMIC SUPPRESSION TIME measures the energy in gunshot noise and automatically sets suppression time for reduced echoes and increased comfort. CLEAR VOICE TRACKING seeks voice within background noise and actively filters noise for improved speech intelligibility.