Webcam Question Urgent

[ImLive]

So USB means the webcam plugs into the back of your computer. Does it plug into the wall also? Do the rest of them then plug into an electrical outlet or also into your computer? Thanks.Smiley (flower)Smiley (H)Smiley (flower)(Trying to decide between 2 Logitechs (930E and the 920)Anyone use these?)