car charger

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hi all!

I have this charger.
It says output: 5 V , 500 mA.

Can I use it with my Niki100 without risk??

One more question:
This charger has 2 inputs.
Can I use them in the same time, charging my Niki100 AND my GPS device??
Will this be safe for my devices??

Thanks in advance!
Dimitris

I do not know of that one I got an Igo from radio shack answer it works good for all my needs. has replacement tips for different devices 20 dollars us for main and 6 dollars us for new tips