Roadster 2 automatically turns on and connects with your phone when you enter your car. When you"re ready to leave it automatically turns off, saving battery life. Listen to calls or stream music on a powerful 2-watt speaker or through car speakers using the FM transmitter Have crystal clear calls with Crystal Talk technology on Roadster 2. Your speakerphone"s dual microphone noise cancellation and echo control settings block out background noise in the car better than other speakerphones.