It is supported to set up maximum object size and minimum object size at the same time for the person, vehicle, or pet detection separately.
If the moving object is smaller than the minimum object size or bigger than the maximum object size, it will not trigger the alarm so as to reduce the false alarm caused by spider webs, light changes, and raindrops.
You may follow the steps below to set the object size via Reolink App.

Applies to: Reolink cameras support smart detection.

Here is a video for your reference:

Step 1. Launch Reolink App and log in to the camera, tap the settings_icon.pngicon on the top right to go to the device settings page. 

Tap Detection Alarm > Object Size. 


Step 2. Tap to choose a detection object (person/vehicle/pet) and the camera lens that you want to set up. 
Step 3.
Tap Minimum Object or Maximum Object. Use your finger to zoom in or out on the yellow or blue frame on the screen to adjust the size you want to set. Then tap Save on the top right to save the settings. 


Step 4. Tap the Rubbish Bin icon if you want to delete the object size settings. Tap Save to save the settings.
Step 5. Choose other detection objects to set the object size.



Note: Object size is set for two lenses (Camera 1/Camera 2) together, and cannot be set separately.