There is no charger - it runs on batteries. This is JUST the gps unit.
I found an online review and perhaps this will give you a little better idea of what this unit can do:
An incredible value, the eXplorist 300 features Magellan TrueFix technology for superior accuracy and reliability. eXplorist 300 gives you a trio of advanced tools for even easier navigation. The barometer provides information on changing weather. The altimeter easily determines your present elevation. And the electronic compass shows your direction, even while standing still. eXplorist 300 includes 8 MB of built-in maps, three navigational screens and the ability to save 5 track log files, 500 points of interest and 20 routes. By putting all of this together in one compact package, the eXplorist 300 offers an unprecedented value.
This model originally sold for $249.00. You can see more stats at http://www.tigergps.com/maex200haheg1.html