I received this 7 watt solar charger in the mail from Target and started using it the next day. I was a bit intimidated by this because it is new technology for me and I have a hard time adapting to new things. (you can also get it from Amazon here).
But this was a cinch! I bet even my grandma could use it successfully.
Basically, as long as you know how to plug in the USB cable to charge your phone, you can use this. Super simple.
It comes folded up, and folds easily so that it is the size of a large wallet with a checkbook cover, you know about the size I am talking about. Maybe the size of a 7" tablet when all folded up.
It comes with some clips so that you can clip it to your backpack while hiking or biking or walking around. Or hang it outside your window or deck, or like I did, put it in my home office, on my cat stand (my cat wasn't too happy about that) and let it soak up the sun's rays.
The indicator light immediately went to green, letting me know that I could charge. And so I plugged in my cell phone and later on, my MP3 player, and it charged! No electricity needed, and I was able to charge my phone and my MP3 player. Totally cool.
I am glad I got this and plan on using it wherever I go, even camping!