For uniform and color-accurate illumination when viewing, sorting, and digitizing slides and other transparent originals. Various power supply options: via the built-in lithium-ion battery, the included power adapter/charger, or with the USB cable, e.g., 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 originals. cm and inch scales next to the illuminated area. A short touch of the touch switch activates the illuminated area, while a longer touch results in a stepless brightness adjustment.