The DEWALT Heavy Duty Black Edition 2-In-1 Neckband Bluetooth Headphones are designed for heavy-duty use on the job site. With a frequency range of 20 Hz - 20,000 Hz and passive noise cancellation, these headphones provide clear and focused audio for live monitoring. The wireless communication technology, Bluetooth version 5.0, ensures a strong connection for up to 60 hours of battery life. The neckband design with built-in speakers and rounded tip earpiece shape offers comfortable wear for extended periods of time. These headphones come with ear cushions, ear fins, a Type C charging cable, and a user manual for convenience.