This 3.5X 10D pocket magnifier is a rectangular aspheric lens with a strong white light. The lens is slightly turned so it is comfortable to hold. Like all magnifiers in our SMARTmag line of magnifiers, this magnifier is illuminated by 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 3x magnifier. There is a Lifetime Warranty from the manufacturer on the LED lamp, switch, and 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 is found progressively closer to the lens. This magnifier also comes with a Contrast Yellow light.