Title: not perfect but about the best you can find in the market
Review: I got this item after I tried Arkon SF121. SF121 is battery powered so it is not powerfull enough to stably lock to a station. It keeps drifting as the temperature of the car changes which happens every five-ten minutes. It get worse when battery is weak. SF100 is more powerfull and more stable. You don't need to worry about replacing batteries. It is supposed to power my MP3 player but that didn't work for my Rio Volt SP250. The signal still shifts as the temperature changes in the car but much less than SF121. I think it is acceptable to fine tune the dial every hour or so rather than every 5 minutes.
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