ipod car power adapter

Which voltage setting to use for iPod Car Adapter?

I purchased a product from Jensen, Car Power Adapter – model # JCD22A. It’s supposed to convert from 1000mA current (cigarette lighter) to the voltage used for an ipod, wihch can be 1.5, 3, 4.5, 6, 9, or 12v.
I know NOTHING about this type of stuff, and don’t want to fry my ipod. Anyone know the correct voltage to use, or if it even matters?
Thanks!

yeah dude dont worry i got your advice for both of the answers your the best one ive got so far but i begin to wonder why? because you work for a game company lucky one!! the second question i asked you really put lots down and i read it thanks again i just wanted to get your feedback dude thanks again!

iPhone iPod touch Car Power Adapter FM Transmitter IP-500 – dinodirect