VIZIO M550SV 55 Inch Class Edge Lit Razor LED LCD HDTV with VIZIO Internet Apps VIZIO Internet Apps with built-in WiFi 802.11n Edge Lit Razor LED backlighting with Smart Dimming 240 Hz SPS Refresh Rate 2 million to 1 Dynamic Contrast Ratio 1080p Full HD 55-inch class (54.64 inches viewable) LED-backlit LCD HDTV with 1080p resolution and VIZIO Internet Apps Energy-efficient LED backlighting with local dimming for truly deep blacks, brighter whites, and vivid colors Built-in Wi-Fi connectivity with Internet Apps for access to Netflix, VUDU HD movies, Pandora Internet radio, and more 240Hz SPS refresh rate for smooth, super-sharp viewing for fast-action sports and movies Built-in ambient light sensor adjusts backlight levels based on surroundings