Just for people who wants to rock with minimal or no extra work/wiring done. I bought my second 850 wagon which didnt had CD changer and I didnt wanted to through in a aftermarket CD/MP3 player but was hunting for volvo CD changer that could go with SC811 stock Radio but came accross this beutiful/handy/utility device called FM transmitter with SD card and USB slot and comes with sleek handy remote as well.
It just plugs into your cigarete lighter port and remembers the last settings and song even after turning OFF and On again.
The frequency is selectable throughout the FM range (87.9- 107 Mhz) in increment of .1 and the performance is 95/100 as compared to CD but it saves a lot of hastle and cost of CDs. Just dump hrs and hrs of muzik on 1gig SD card or USB drive($6) and push it into the slot and plug this device into the cigaret lighter and tune your radio to the selected frquency and there you go rocking for many hours. It also has backlit dispay to make things easier.
TIP - keep the volume low (10 on scale of 14 on the model I have)from this device to achieve best quality.
This is commonly available here in Toronto for about $15.

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that is really cheap for such a device... usually a standard FM modulator will run about $50 in a store..