Built-in omni-directional microphone: Hear and be heard with a 360-degree microphone that picks up sounds from any angle. Smart button (off by default): Interact with your voice assistant (smart phone dependent) or make a speed dial with the one-touch Smart button. Must be configured in the PC app Direct. Link 370 USB Adapter (Bluetooth Class 1): Easy Bluetooth connection and call control integration with your softphone system. 15-hour rechargeable battery: Up to 15 hours of talk time on a single charge.