The SpecLights clip onto the bridge of your glasses and provide additional light when no light or not enough is available to complete the task at hand. The SpecLights have two bright LED lights in broad beams that last up to 50 hours. The lightweight, adjustable clip mechanism that tilts to any viewing angle has rubber-coated "legs" that ensure your lenses or any coatings on them will not be scratched. You can adjust the brightness level by choosing to use one or both of the LEDs at a time. The SpecLights require 2 CR2032 button batteries (4 batteries are included with your purchase). A black crush-proof case is also included. The glasses in the photos are for demonstration of this item only; no glasses come with this item.