If the box looks like this, it's the dealer-installed Power Code remote start kit.
There should also be a little antenna mounted to the windshield by your rearview mirror, the shape of which determines which remote it uses
Uni-directional kit and Bi-directional kit for a 2010 Flex
There should also be a little antenna mounted to the windshield by your rearview mirror, the shape of which determines which remote it uses
Uni-directional kit and Bi-directional kit for a 2010 Flex