The Allen® ULTRX™ Bionic E-Muff 22dB NRR Electronic Hearing Protection with Bluetooth boasts premium protection and safety and is ANSI S3.19 tested and certified with a Noise Reduction Rating (NRR) of 22dB. Featuring Bluetooth® compatibility, this set of electronic earmuffs can seamlessly pair with your devices so you can enjoy music or stay connected in noisy environments. Built-in 4 hi-gain omnidirectional microphones enhance your awareness of your surroundings and are designed to automatically shut down at 82 dB to further protect hearing. Even better, Studio Harmonics technology provides exceptional sound quality and clarity that's comparable to a high-definition studio-grade audio system. The extra-padded headband folds for easy transport while soft gel ear cups ensure maximum comfort and provide a cooling effect that's perfect for extended wear. Constructed with a rubberized exterior. Operates on a rechargeable lithium battery and includes USB-C charging cord.