"DRR radios" refers to digital relay radios that enable clear, reliable communication for professional use. They are commonly employed in industries such as manufacturing, construction, transportation, and public safety. These radios often include advanced noise cancellation, extended coverage, and longer battery life, with optional compatibility to integrate with existing systems. They operate using a daisy chain topology, forming a long mesh network of radio nodes across the site. Designed for durability, DRR radios perform effectively in demanding environments, ensuring seamless communication during extended shifts.