Behind-the-Head design. This headset is used in applications from auto racing to industrial, and heavy equipment operation, providing tough reliable 2-way communication through 2-way radios and intercom systems. Simply select the optional cable for your application. Features DNC microphone for clear transmissions and Clear Hear speakers for unsurpassed audio performance. Rugged headsets are built to perform in extreme noise environments - combining the latest technology and firm, yet comfortable fit for optimum communication.