From Duracell's Facebook page:
"When Cee Lo Green heard about what Duracell was doing to power volunteer firefighters, he wanted to help. The issue hits home for Cee Lo, who wanted to be a firefighter when he was growing up—and whose mom served as a volunteer firefighter. His message in the lyrics of “Thank You” is one of deep appreciation for all of the courageous heroes who sacrifice their time and energy to help others. Download the limited edition song for free here, and keep spreading the message of thanks!"