40X-1600X Compound Microscope with 9" Screen & 5MP Camera (4 Eyepieces, 4 Lens, Phone Holder, Hand Case, Accessories Included), Kentfaith Lab-quality Compound Microscope Kit

SKU: GW45.0113

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Hi, because it features a 5MP built-in camera, and the camera captures the image directly from the objective lenses, bypassing the eyepieces when you’re using the screen. 
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Yes, directly connect it to your PC via a cable included. 
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No,it doesn't. You can try to use the dark field filter, but the effect will not as good as a professional dark field microscope. 
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No, this product does not have a polarization function.