Anyone know where I can find this device that plays computer sounds over a radio frequency?

Question

Once upon a time I had a device that allowed sounds from my Laptop to be played over any radio. You just plugged it into the audio jack, tuned into the frequency recommended and presto; you can play all your music on your radio in your car or home. Does anyone know exactly what its called and where I can find it?

Oh and one more thing, I need one that works on batteries instead of a car adapter. but that was a good answer.

Answer 1

You can get that anywhere these days. Here's one place:
http://www.circuitcity.com/ssm/irock-Wireless-FM-Transmitter-440FM-/sem/rpsm/oid/115947/catOid/-12939/rpem/ccd/productDetail.do