Automation could mean it analyzes your average usage, and when you will run out in (amount of time it takes product to get to you + 20% for a buffer) it will or

Automation could mean it analyzes your average usage, and when you will run out in (amount of time it takes product to get to you + 20% for a buffer) it will order more. Or hell, when you are at 50/25/10%, order another. And if you are uncomfortable with it ordering it for you, it could just add it to a shopping list for you.