The newest 4th generation DermLite achieves brighter white illumination in both the polarized and non-polarized modes. With its amazingly smooth, ergonomically optimized all-aluminum design that comfortably molds to your hand, DermLite DL4W puts phenomenal versatility, the largest optics of any pocket-size DermLite, and instant on/off control right at your fingertips. The DL4W has brighter polarized & non-polarized lighting, a larger field of view, and is still more than 25% smaller than the previous generation. This unit has a 10 year warranty. This product is ISO certified.