See this post for a link to buy.com who has it cheaper with free shipping. I have it and it will definitely operate for over 4 hours on alkalines. It sounds pretty good, but probably less good than an FM modulator that sits in-line with your antenna. I was able to stand 25 feet away from the car, and the sound was still acceptable. I'm not sure what that test proves, but it works.
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-Rob Riccardelli
80GB 16MB MK2 090000736