Autodoor

A door allows colonists passage through walls or dug rock.
It acts like a power conduit and needs a direct link to a wall or to a power conduit to open/close quickly and distribute power.
Although it still opens if not powered, colonists have to manually open it, which requires much more time to open and close it.

Use it only on entrances of your cave system (so no boomrats can come in) and for personal rooms. Everywrhere else use power conduit for connecting different walls.