

The devices are charged via a receiver that works on magnetic induction. Energy is transferred via an electromagnetic field (ChaCha Answers) which causes to charge your electrical device.
Pros and Cons
Pros: You can charge your device in the car or nearly anywhere that doesn't have power to connect to.
Cons: You need a special case for your device to charge it, which costs more money. Whats the point?
I don't know what I see about technology being used in the future but i think wireless charging can be really useful for people.