Leupold's Golden Ring binoculars with Switch/Power Technology feature a precision-machined switch in front of the focus ring that instantly and fully changes the power setting, so the object you're viewing always stays at the center of the visual field. This is no zoom...scan at 7x or 10x, then with a flick, you're instantly viewing at 12x or 17x. It's like carrying two binoculars, and they're as easy to use as a light switch.