VIZIO E420VT 42 Inch Class Edge Lit Razor LED LCD HDTV Edge Lit Razor LEDTM backlighting 1080p Full HD resolution 100,000 to 1 Dynamic Contrast Ratio SRS TruSurround HD and SRS TruVolume audio Ambient Light Sensing Technology 42-inch LCD HDTV with Full HD 1080p resolution and VIZIO Razor LED backlighting Built-in ambient light sensor adjusts backlight levels based on surroundings View full-screen slideshows of your JPG photos from connected USB devices SRS audio technologies for virtual surround sound and volume smoothing Four HDMI inputs for connecting your Full HD sources