Designed to offer protection to the wearer from harsh and extreme noise levels the ISO Tunes Men’s Sport Advance Lightweight Ear Defenders features tactical sound control technology for enhancing hearing up to 8x a lightweight rechargeable battery and a seamless Bluetooth connectivity. The SafeMax technology helps in limiting the volume output to 85 dB offering you a damage-free hearing all day. With IP67 rating the defenders ensure protection against sweat water and dust. These are 26 NRR tested and approved to ANSI s3.19-1974 which further ensures clear communication even in loud environments., Tactical Sound Control Technology enhances your hearing up to 8x while protecting you from high-impact noises in under 2 milliseconds. Lightweight Design at just 23.25 grams., Rechargeable Battery provides up to 10 hrs of connection to any device. Automatic Power Off after 2 hours without Bluetooth connection for battery conservation., SafeMax Technology limits volume output to 85 dB for all-day damage-free listening. Bluetooth 5.0 connects and dual-connects devices up to 30 feet., IP67 Durability for dust water and sweat proof protection. 26 NRR tested and approved to ANSI s3.19-1974., Noise-Isolating Microphone for clear communication in loud environments. aptX high-fidelity sound with codec support.