Can this camera operate on battery alone, or does it need AC (to be plugged in)?

The specs say it requires "AC, battery" but does that mean it needs both, or that it can use one or the other? I want to place a camera where it cannot be plugged into an AC outlet, so I'm looking for one that cannot operate solely off of batteries.

FLIR FX Outdoor Wireless HD Video Monitoring Camera

FLIR FX Outdoor Wireless HD Video Monitoring Camera

Product No Longer Available

No Answers have been submitted