If they're like mine - then they are indeed "roller bearing, full extension" drawer slides.
Pull them out as far as they'll go and look down on the metal slide part that attaches to the drawer. There is a small, black plastic lever, hinge, tab that will appear only when the slide is completely extended. You simply tug it to release one slide.
On one side of the drawer, you push it down to release and on the other side of the drawer it is pushed up. I usually hook a thumb on each, push and tug the drawer.
Here's a link to one Youtube video of several: