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The 43S425 is a member of our 4-Series while this 43S525 is a member of our 5-Series. Each series builds on each other. Both of these series are 4K UHD, have HDR support, and have a Roku operating system. The 5-Series additionally has Dolby Vision Support, wide color gamut, auto-game mode, an edge-to-edge glass display, etc. You can also visit https://www.tcl.com/us/en/products/home-theater/5-series/tcl-43-class-5-series-4k-uhd-dolby-vision-hdr-roku-smart-tv-43s525 to see all of the great features our 5-Series has to offer. Hope this helps! Thank you, TCL Customer Support
Sorry, there was a problem. Please try again later.My 3 class 4s are still running 5 years later My lone 5 series is dead after 2. Don't buy this junk
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