Unable to register to base

[cho]

Hi, I've tried multiple times to get my newly received handsets to register to the base. Upon receipt of the handsets, I noticed that they came with European plugs (I'm based in the USA), but didn't think anything of it. After resetting my base station to factory settings, and trying multiple times to get the handset to register, I noticed that the phone's "Handset Status" area is Europe. I presume this is why it won't register? Please let me know before I return everything.