Features Film viewer led box: 1. LED light source: High light source brightness, long open without heat, uniform light emission, adjustable brightness. (This lightbox has 10 levels of brightness adjustment.) 2. Support foot design: The placement position can be adjusted at multiple angles (horizontal, vertical, inclined), making it easier to view films. 3. USB powered. 4. Equipped with a 10x magnifying glass. The 10x magnifier loupe made of optical grade glass, it's more clear, high contrast, and let you see more details. 5. It is recommended to use it with a copy stand when copy the film negative. (The copy stand on the picture is not included.) Film Holder: 1. The film negatives generally has curl (not flat enough), the function of the film holder is to make the film have a better flatness, so that it is easier to obtain a clear image when copy the film negative. This film holder is very important, if there is no film holder, it will be the same as an ordinary A4 light box. 2. There is a velvet cloth inside, which does not scratch the film. (Note: 4X5 film holder do not have velvet cloth.) 3. MULTI-FORMAT VIEWING (By your choice the film holder): 35mm 135 film 120 (6X4.5, 6X6, 6X7, 6X8, 6X9) film 4X5 film Easy to installation: Insert the two feet at the bottom of the film holder into the corresponding card slots of the film viewer light box, then press down the film holder and fasten it on the film viewer light box. Tips: Please allow 1-3cm error of measurement. Photo color might be a little different from the actual product due to color display of different monitors. Product Includes: A: light Box+135 holder B: light Box+120 holder C: light Box+135+120+4x5 holde