- The ULTRX™ Stereo Earmuff is your ultimate companion for hearing protection and enhanced audio experiences. Engineered with a Noise Reduction Rating (NRR) of 24dB, this earmuff meets ANSI S3.19 and CE EN 352-2 standards, providing top-notch noise reduction. The built-in stereo microphones help amplify ambient sounds, ensuring clear communication in noisy environments. Features an automatic shut-off mechanism at 82dB, safeguarding your hearing to its upmost potential. Powered by 2 AAA batteries, its compact foldable design makes portability a breeze. Elevate your hearing protection game with the ULTRX™ Stereo Earmuff, where safety meets superior audio.