The SL-ZW1 is a polarized USB powered LED light that can be used with polarized Dino-Lite models. With a simple rotation, you can adjust the amount of polarized illumination required for the right image. Great for conditions where the Dino-Lite is too far from the object but still requires polarized illumination. To take advantage of the polarizing light, the accessory is best to be used with Dino-Lite models that have the polarization ability. If the Dino-lite does not have the polarization feature, you can still use it as additional external lighting or as a side light to enhance the view of surface topography.