The good: The Plantronics K100 features a dual-microphone setup that aids in echo cancellation, and a loud, clear internal speaker. A built-in FM transmitter combines with A2DP support to enable the K100 to serve as a Bluetooth-to-FM bridge between a smartphone and a car stereo for audio
The bad: The K100 doesn't have a dialing system or an internal phonebook, so it doesn't play well with phones that don't have voice command systems of their own.
The cost: $49.10 to $91.44
The bottom line: The Plantronics K100 delivers great-sounding, hands-free calling on both ends of
the line, and its FM transmitter is a nice bonus when it works, but look elsewhere if your phone is one of the few that don't support voice-activated dialing.
The built-in microphone on today's phones can be less than ideal for canceling the levels of road and wind noise present in a car at highway speeds, which leads to poor quality on the receiving end of your calls. Visor-mounted Bluetooth speakerphones feature more sophisticated microphones with noise and echo-cancellation technology located closer to your head, which can dramatically improve sound...
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