There was a completely transparent thin thread connected to the door lock. The end of the thread was tied to the wind chime hanging at the entrance. There were transparent warning threads tied to the windows.
If one did not have special equipment, they would not be able to see these transparent threads even if they were standing in front of them, unless he touched it with his body. However, it would trigger these warning devices.
It was only because Xu Tui had a mental perception that he noticed it. If it were any other extreme-type cultivator, they would not be able to discover this warning equipment unless their perception was extraordinary.
Any normal person or ordinary person would not have made such warning equipment given the security situation in the Huaxia Sector. On the other hand, if Engineer Qian did such an arrangement in his rented residence, there would be a problem with him.
