Chapter 1616: One Trillion

[Hint: The roller power energy collector can only be used by demon creatures] Looking at the instructions on the scroll, Luo Yu smiled.

"This technology is simple to build, but the power generation is much more efficient than the hand-cranked generator."

"Ling'er, send a message to build this type of treadmill on a large scale in each county. Once I capture a large number of demon slaves, it can be put into operation."