The way I’d think about it is this:
- You can define a box in front of the switch where presence is detected. You can define the floor and ceiling height, left and right width, and depth (near and far). These are in cm. Note: this can (and in some cases should) be smaller than your actual room size to avoid triggering for pets, fans, or to account for some variance in distance.
- Sensitivity determines how much motion will trigger presence detection. This is 1-3 (low, medium, or high)
- Hold time looks at motion moving out of the room, such as when you walk out. It will wait the defined number of seconds before setting presence to empty. This helps if you don’t want it to clear right away.
- Stay life determines how long to wait if the sensor loses you but you didn’t walk out of the room (i.e. you were sitting or laying too still). This is in 50ms increments (1=50ms, 2=100ms, etc.). I have this set to a much higher setting in bedrooms.