The Allen® ULTRX™ Bionic Fuse 24dB NRR Electronic Ear Buds provide premium protection and are ANSI S3.19 tested and certified with a Noise Reduction Rating (NRR) of 26dB. Dual built-in microphones enhance your awareness of surrounding sounds and are designed to shut down automatically at 82dB. These ear buds are Bluetooth® compatible allowing you to enjoy your favorite music or podcast and stay connected while working in loud environments. Plus, these ear buds are designed with 3 program settings for versatile adaptability; Bluetooth Mode enhances music/verbal audio and content streaming, Sound Amplification Mode 1 provides external sound amplification in soft noise environments, and Sound Amplification Mode 2 provides external sound amplification in loud, high decibel environments. The provided charging case makes for easy storage on the go and recharges your earbuds. The included USB-C cord charges the case so you can be ready anytime. Includes multiple insert options (4 sizes of foam and 3 sizes of silicone). IPX5 water protection.