By using the Simple Filter you can set your Action to execute its command when a device is added to a folder, removed from a folder, or both. For example:
If you create a folder that contains printers whose page count is greater than 10,000, once a printer's page count exceeds that amount, the printer will be added to that folder.
If you create a folder that contains printers with a flash device installed, and someone removes the flash from the printer, it will be removed from that folder.
By using the with a delay of: option, you can delay the execution of your Action until a device has been in or out of the folder for a specified amount of time.