How the pre-moisturized automatic flush works.

If you have encountered the problem of automatic toilet flushing when sitting on the seat and moving, you can understand the principle.

The toilet uses the seat sensor point to determine if someone is seated, and once the person is seated (the left buttock touches the seat sensor point), the toilet will be pre-moistened to prevent stains from hanging. Once a person leaves the seat (left buttock leaves the seat sensor point), the toilet will flush automatically.
The attachment is the seat sensor point.