ISOtunes LINK is the premier Bluetooth Hearing Protection built for real, heavy-duty work. All LINK Bluetooth earmuffs are ANSI-certified hearing protection headphones with proper Noise Reduction Ratings (NRRs), so you can rest assured you are getting quality ear protection that has been designed for noise reduction and tested in 3rd party, independent labs. ISOtunes LINK Bluetooth Earmuffs feature Bluetooth 5.0 so you can stay connected and protected while you work -- comptabile with phones, computers, tablets, and 2-way radios. Stream high-fidelity audio wirelessly or take calls with the built-in microphone. All models are compatible with the LINK boom microphone (sold separately), which enables crystal-clear 2-way communication in high-noise environments. Some LINK Bluetooth earmuff models are also available with the signature ISOtunes Aware Technology, which enables situational awareness in loud environments while electronically suppressing harmful noise to a safe listening level. LINK Buetooth earmuff models are available in headband-styles or helmet-mounted styles. The signature of the LINK Bluetooth earmuff series is the high-quality, durable build, which you can feel as soon as you hold the headphones. These hearing protection earmuffs are built to last and come backed by the industry's best warranty.