Film viewer led box: 1. LED light source: High brightness of the light source, long open without heat, uniform light emission, adjustable brightness. (This light box has 10 levels of brightness adjustment.) 2. Support foot design: The stand position can be adjusted at multiple angles (horizontal, vertical, tilted), making it easier to watch movies. 3. USB powered. 4. Equipped with a 10x magnifying glass. The 10x magnifying glass is made of optical glass, clearer, higher contrast, and lets you see more details. 5. It is recommended to use it with a copy stand when copying the film negative. (The copy stand in the picture is not included.) Film holder: 1. The film negatives usually have a curve (not flat enough), the function of the film holder is to make the film have a better flatness, so it is easier to get a clear image when copying the film negative. This film holder is very important, if there is no film holder, it is the same as an ordinary A4 light box. 2. There is a velvet cloth inside, which will not scratch the film. (Note: 4X5 film holders do not have velvet cloth.) 3. MULTI-FORMAT VIEWING (You can choose the film holder yourself): 35mm 135 film 120 (6X4.5, 6X6, 6X7, 6X8, 6X9) film 4X5 film Easy to install: Insert the two feet on the bottom of the film holder into the corresponding card slots of the film viewer light box, then press down the film holder and attach it to the film viewer light box. Package: (according to your choice): A:1X Film viewer light box (with USB and magnifying glass) +1X 135 film holder+1X 120(6x6) film holder+ 1X 120(6x9) film holder+1X 4X5 film holder or B: Only 1X 135 film holder or C: Only 1X 120(6x6) film holder or D: Only 1X 120(6x9) film holder or E: Only 1X 4X5 film holder Note: Due to the light and screen difference, the item's color may be slightly different from the pictures. Please allow 0.5-2cm differences due to manual measurement.