We just made a 9+ hour trip from Charleston, SC to Fort Walton Beach, FL with our 20 month old (at the time) twins, and instead of buying a dvd system, we just bought an inverter, and used one of our laptops. The inverter was $30 at Wal-mart.
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Re: DVD for the car...
I can't compare since i've only had this one, but I like my Panasonic brand DVD player