Targeted NRR of 26 dBA 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. Bluetooth® Wireless Technology to seamlessly sync to mobile devices. Engineered for optimal fit and comfort. IDEAL FOR both indoor and outdoor shooters and hunters. BLUETOOTHT 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. DURABLE RECESSED MICROPHONES prevent damage and reduce wind noise. Assembled Product Dimensions (L x W x H). 4.57 x 7.78 x 11.58 Inches.