This 4X 12D pocket magnifier has a round aspheric lens and a strong white light. Like all magnifiers in our new Advantage line of lighted magnifiers, this one is illuminated with LED and uses three triple A batteries in a convenient hinged compartment on the handle. It comes with a sturdy box and a soft leather pouch to carry it in. This is slightly stronger than the 3.5x, rectangular magnifier. There is a lifetime warranty on the LED, switch, and the hinged compartment. The proper way to use this magnifier is to hold it to your eye and bring what you are reading up to the magnifier until focus is achieved. This is how you will get the widest angle of magnified view. The weaker magnifiers achieve focus further from the lens. With stronger magnifiers, focus becomes progressively closer to the lens. This magnifier is also available with a Contrast Yellow light.