VIZIO SV421XVT 42-Inch XVT-Series 1080p 240 Hz SPS LCD HDTV 50,000:1 Dynamic Contrast Ratio for darker blacks and brighter whites SRS TruVolume eliminates volume inconsistencies between programming SRS TruSurround HD delivers immersive virtual high definition surround sound 240Hz displays 240 scenes per second by combining advanced 120Hz technology with scanning backlight