I bought a Griffen Itrip to work with my IPOD Nano 4GB.  I purchased the unit on Ebay for $34.  After reading reviews on other sites that warned of potential transmission interference and "popping" or "static", I was pleasently suprised to find that the device actually works fairly well.  I have used it with my home stereo and in two vehicles.  I live in Phoenix Arizona where there are FM transmissions on almost every frequency available.  I found that on frequency 87.9, the Itrip is effective everywhere I have traveled.  It actually over powers other recievable stations.  The only draw back is that at home, I have found that the Itrip must be very close to my stereo reciever (Bose Lifestyles) to work effectively.  It does not work well from more than a few feet away.  This is a bit of a bummer because I would like to be able to be able to operate the IPOD from a greater range.  It is also worth noting that the Itrip does not have a battery.  It feeds off the IPOD battery.  Without an external power source, battery life is somewhat less than desireable. 

I hope this information will help you in selection of the right device to best serve your needs.

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