It's called X2 because it has two ways to foil the squirrels.
1) The hinged roof tilts with the weight of a squirrel and closes both ports.
2) Two integrated metal perches are spring loaded to close both ports from the weight of a squirrel.
Feed Birds, Not Squirrels!
Constant food at both ports (for birds, that is).
Wide mouth for easy filling.
Attractive burnt-penny finish.