This device can be used by placing the "vacuum" end adjacent to a standard container like a metal box or filing cabinet. Just connect the conveyor end to any conveyor, hopper, factory, or sorter and items from the adjacent containers will be transferred down the line. The vacuum hopper can even pull items from your settlement's workshop (but not other crafting stations).
The vacuum hopper pulls one item at a time and will pull all objects stored in the container (if the vacuum and the storage are close enough, even through a wall), regardless of whether or not subsequent manufacturing machinery can process it. Using an attached terminal, you can adjust the time interval at which it pulls objects, and the velocity with which it outputs them.
The default interval for rate of vacuuming is 1.0 seconds. The options include 0.5 seconds (at which the terminal indicates "WARNING: Timer outside manufacturer recommended settings. Jamming may result) 2, 3, 4, 5, 10, 15, 20, 30 seconds.
The output force options include 1, 2, 5, 10, 20, 30 (no units specified). Setting it at 10 or higher yields the message "WARNING: Output force exceeds recommended safety parameters."
Vacuum hopper (1)