I tried it once or twice on the drive home (while waiting for long stoplights) and noticed that it is very sensitive to external noise. Things like the A/C fan

I tried it once or twice on the drive home (while waiting for long stoplights) and noticed that it is very sensitive to external noise. Things like the A/C fan motor, the radio, and how far away you are from the microphone all play a big part in recognition quality.