According to the installation manual for the KD-S28, the bluetooth adapter is KS-BTA100. You can find this on page 2 of the installation manual which is available from JVC's support page:
http://books.jvc.com/ . Enter the model number and click the Model Search button. The direct link to the installation manual is
http://books.jvc.com/Download/119824748/GET0754-002A.pdf .
I hope this helps. Amazon has a couple of the adapters for sale: https://www.amazon.com/JVC-KSBTA100-Add-On-Bluetooth-Adapter/dp/B004REMUJE . Other vendors do not report having this in stock.
Cindy Wells
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