This is to set how sensitive the motion will be. You can see it is set to Automatically adjust the sensitivity by default. But when you turn off automatically adjust the sensitivity, you will see a slider bar, and you can drag the slider bar to set sensitivity. The more sensitive it is, it only needs a little motion to trigger the doorbell sensor, vice versa, the less sensitive it is, the bigger motion to trigger its sensor. So, when you think the doorbell won’t last long, you can adjust the sensitivity.
