RCWL-0516, ESP and cats

After the last video with this sensor, some questions remained open. Can you use it with the ESP8266? Is the water in the human body responsible for the detection?
Be sure to watch the video of the sensor first
https://youtu.be/9-q2klKJ280
Project Page:
https://rohling-de.blogspot.de/2017/04/coolest-motion-detection-sensor.html

Amazon
NodeMcu - http://amzn.to/2tUftYU
RCWL-0516 - https://amzn.to/2KTNLSI

Видео RCWL-0516, ESP and cats канала nenioc187