Applies to: All Reolink cameras and NVRs
How does PIR work
You may kindly refer to What is PIR sensor to learn about how does PIR sensor work to realize the alarm function.
How does Motion Detection Work
Our PoE cameras and WI-FI cameras can realize the alarm function by motion detection. These cameras' monitoring screens are being divided into a lot of macroblocks. They also have an algorithm to judge whether there is any macroblock moving. when the number of moving macroblocks reaches a certain proportion in the deployed macroblocks, cameras start to alarm.