The explaining process is not Li's forte long and boring - to most. For Ai-Ling, who's always so curious about everything, and Sokka, who could talk about electronics for hours...

They tend to have very long conversations.

"These aren't as advanced as the ones I've seen before," Sokka continues, having taken the watch off and handed it to Ai-Ling, "but those need to change batteries every year or so. These are eternal, since they're solar-powered. But I will occasionally forget to leave mine out and will have to wait until it's sunny again to use the stupid thing."