chapter 252 Arlet Tang’s request

Cyneburg Wu took the metal ball and looked at it, and found that there were many tiny pores inside it. When it flew in the air at high speed, air would pour into the pores.

As soon as his heart moved, he twisted his two fingers, and the metal ball began to rotate at high speed. Once it rotated, due to the symbols on the surface and the pores inside, it could automatically float in the air and emit a sound wave that was inaudible to human ears.

This sound wave made Cyneburg...