For users who already own an Alpine car audio receiver, the KCE-400BT offers an easy way to extend the functionality, safety, and usable life of the headunit by adding clear, hands-free calling and wireless audio streaming.
For users who spend much time listening to broadcast stations that offer HD Radio, the Alpine TUA-T550HD's increased sound quality and functionality make it a worthwhile addition to an Ai-Net compatible Alpine receiver.
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The Alpine CDA-9857 is a solid but unspectacular single-DIN car stereo. It really gets interesting when expanded through its convenient AI-Net port and dedicated iPod connection.