Got it!
Feelings.
It's just a glowing warming pad. But on second thought, with this appearance, it's enough for the world to love it. Does it need any other features?
No.
Absolutely not.
Appearance is justice.
Upon closer inspection, there's light flowing inside, very beautiful, just a bit expensive.
Synthesis.
It means that future costs have a huge room for reduction. Unless someone is a bit foolish, who would buy something that's likely to depreciate crazily in the future?
At this moment.
Tang Nian'er's little head leaned over.
"Wow!"
"So beautiful!"
"Can we buy one?"
"..."
Tang Kai was speechless, this silly girl. He turned to Tang Qing, "Tangtang, does this need to be charged?" According to the conservation of energy, it can't disperse heat indefinitely.
"Of course it does."
Tang Qing nodded.
"How often?"
