Car FM Stereo Connector 30-Pin vs 3.5mm Earphone

I have an iPhone 4 and I am trying to buy below Car FM Stereo adaptor. This one connects to the iPhone 3.5mm earphone connector instead of Apple 30-pin. I don't really want something that works with iPhones only, but works with other smartphone, so I prefer 3.5mm RCA connector (haven't decided which upgrade phone I want yet).
In iPhone 4, do you have to use the Apple 30-pin for the audio or can you use 3.5mm RCA as well? If you can, are there any quality degradation?
http://www.amazon.com/Excelvan-Wireless-Transmitter-Automobile-Smartphone/dp/B00 8N7CCJY
Thanks in advance,

I've always used an RCA cable to my AUX jack. Perfectly pleased with the sound quality.

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attached image for my umi and motor drive, the way i connect it.
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Attachments:
umi7774_ServoMotor.jpg ‏63 KB

III:
I see no one has responded to your multiple posts over the past few days. I'll try to help but I have no experience with the UMI-7774.
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"It’s the questions that drive us.”
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Car FM Stereo Connector 30-Pin vs 3.5mm Earphone

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