The VIERA X1 Series is part of Panasonic's entry-level line of plasma HDTVs, and is one of the only Series that offers a 720p native resolution. Compared to the more expensive mid-range and premium lines, the plasma technology used in these displays isn't as good on paper, and produces a lower specified contrast ratio. Outside of the panel Panasonic omits most of the features found on the higher end models retaining only the SD Card slot and Game Mode from the S1 Series. The step-down models blow the X1 Series is the X14s which feature a lower contrast ratio, and remove the SD Card slot and Game mode.