The Sport Tactical 500 features Gunshot Recognition and Suppression Technology that optimizes noise protection based on the firearm being used and the environment in which its being used. Bluetooth Wireless Technology allows the user to seamlessly sync to mobile devices. Clear Voice Tracking Technology seeks voice amongst the noise to improve speech intelligibility and situational awareness. Targeted NRR of 26 dB for passive sound protection.Features : Noise Reduction Rating 26 dB Low-Profile Cups Bluetooth Wireless Technology Durable Recessed Microphones