Compact 1x1 loader requiring electricity to run. There are options to enable or modify capabilities like stacking, disable power consumption, or recipe cost.
As seen here: https://imgur.com/ZMaGfOS
The prometheus (or really any) filtered loader has the filter icon way too big compared to the above one (eggs and q chips) which is more normal. The fusion cell filters on the inserters are the correct size for a single item.