Why does my wireless headphones not play any sound?

Why does my wireless headphones not play any sound?
Okay, so I got these Skullcandy Uproar Wireless headphones in August, it's now December and they aren't working right.

ANSWERS:

I have the Skullcandy Crusher BT headphones. I occasionally get a problem where my headphones will connect, but won't play any sound from any audio device. I will try to clear up how to fix this problem.