For uniform and color-accurate illumination when viewing, sorting, and digitizing slides and other transparency materials. Various power supply options: via the built-in lithium-ion battery, the included power/charger, or with a USB cable, for example, through a power bank, PC, or car. Color temperature of approximately 5000 Kelvin and a color rendering index (CRI) of 95 for accurate color reproduction, both when assessing and photographing the materials. cm and inch scales next to the light surface. A short touch of the touch switch activates the light surface, while a longer touch allows for stepless brightness adjustment.