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The difference between the LG - 65 Class (64.5 Diag.) - LED - 1080p - Smart - HDTV Roku TV - Black, Model # 65LF5700 and the LG - 55" Class (54.6" Diag.) - LED - 2160p - Smart - 4K Ultra HD TV - Black, Model # 65UF6450 is as you can see in the title descriptions. The 65LF5700 is a 1080p Smart TV and the 65UF6450 is a Smart Ultra HD 4K TV. When you see the "UF" in the model number, that means the TV is a 4K Ultra HD LED LCD TV. "LF" indicates that the TV is a 1080p TV...^IFV
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