The detecting distance of motion detection is related to the object size, the range of movement and the sensitivity of your camera, so the specific detection distance cannot be given.

Applies to: All Reolink PoE cameras and WiFi cameras

If you do not want to receive alerts from some of the monitoring areas, you can set up Motion Detection Zone to exclude the specific area. Refer to: 

You can also lower the Motion Detection Sensitivity of the camera to reduce false alarms. Refer to: