what is the space between the earphone jack and the USB jack

I have to purchase a FM Transmitter for my car. I want one that charges my iPod Nano and transmitter in one. However the only ones I'm finding either plug in to the earphone jack of the Nano or has a connector for the old USB that the iPhone 3 or iPod Touches use to use. Not for the new smaller USB insert. Want to know if that space at the bottom, white covering, of the Nano was really on option for an old version of the USB connector. If so, how do you open it?

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