Griffin Roadtrip Fm Transmitter A Good FM Transmitter That Actually Charges A 4g Nano...?

A good FM transmitter that actually charges a 4g nano...? - griffin roadtrip fm transmitter

Ok, does it exist?
There are many FM transmitters that your iPod nano 4th Generation will play to load but none of them?
Ideally, I would like the sender has good sound quality, can not be loaded nano-and light outside of the battery adapter! Does anyone know a good one. I have a Griffin Roadtrip (former) right now. Play for my iPod, but will not load.