Make the day go faster by listening to your favorite music playlist, news program or podcast while you work... without the hassles and hazards of cords! These helmet-mounted, over-the-ear headphones combine noise-reduction technology with the latest Bluetooth 5.0 connectivity, making them ideal for regulated professionals who require certified hearing protection along with the ability to use phones, two-way radios or mesh networks on the job. The included rechargeable battery pack provides up to 50 hours of continuous use, so you can grind through multiple shifts on a single charge. Headphones also accept three AAA batteries (not included) to extend active usage time to 100 hours.Optional boom mic attachment (# href='/products/isotunes-link-boom-microphone'>237390) enhances communication in loud environments. ISOTunes LINK 2.0 Helmet Mount Bluetooth Earmuffs