Smaller Than A Credit Card, The E102 Headset Adapter Brings "Rep Not Available" Feature To ACD Systems Call centers using the most popular models of ACD systems with the "Rep Not Available" feature (RNA) now have the opportunity to enj Features: The Perfect Solution for carbon-based ACD systems that support the RNA feature. Full-Featured Adapter with mute switch and recessed volume control positioned for easy access. Sleek, European Lines. Black matte finish and rounded edges look good, and feel good in your hand. SoundGuard® PlusTM and Call ClarityTM technologies assure the industry's highest standard for sound quality. Compact Design worn on the belt or on a lanyard reduces desk clutter.