Loosen cable modem connector?

Hello all,

I am moving to a new apartment in a few weeks, and I need to disconnect my modem from the wall outlet to move it to my new apartment (I have my own TP-LINK modem; it's not from Xfinity). Will I be able to loosen it by hand, or will I need a particular tool? I don't remember what the Xfinity tech who connected it used. There is a plastic clamp over the metal connector that's holding it to the wall outlet (see picture). It seems very tight (as it should be), but I can wiggle it a bit by hand.

Thanks for any assistance!

Allison