Plantronics K100 Bluetooth Speakerphone - Bulk Dual microphones and Digital Signal Processing (DSP) focus on your voice and cancel out the noise and conversations around you A2DP lets you stream music, podcasts, GPS navigation and more from A2DP-enabled phones FM transmitter gives you the option to play conversations and other audio through your car's speakers for greater volume or to share with others Echo cancellation improves listening on both sides of the call Voice alerts keep you informed of the speakerphone's status, including power on/off, connection status, volume and more