Mobile detection, translated as" Motion detection technology"， Also known as motion detection, it is commonly used for unmanned surveillance recording and automatic alarm. The images captured by the camera at different frame rates will be calculated and compared by the CPU according to a certain algorithm. When there is a change in the image, such as someone walking by and the lens being moved, the calculated comparison result will exceed the threshold and indicate that the system can automatically make corresponding processing. In short, when a person is moving, the machine will detect and push messages and alarm prompts to the user's app.