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. This unit has a 5 year warranty. This product is ISO certified. Intended Use: This device is intended for medical purposes to illuminate body surfaces. It is used for non-invasive visual examination of intact skin. This battery-operated product is designed for external examination only within professional healthcare facilities by medical professionals.