Indeed, according to common sense, there's absolutely no way Bluetooth can transmit over a distance of several kilometers.
But since it's already been done in reality, Li Zhong believed there must be details they didn't know.
After all, the world is big and full of skilled people; it wouldn't be surprising if someone had mastered some special technology.
However, Li Zhong worked in scientific research; a rigorous attitude was a must for people like him.
So for Li Zhong, things had to be scientifically verified.
After carefully piecing together Tang Xiaoquan's later answers and the relevant process, Li Zhong rubbed his chin and muttered, "Xiao Guo, you know, I thought about it, and that scoundrel's method might actually be feasible."
