A battery capacity and usage system, applied to an electric powered boat. The method for outputting an image in a mobile terminal comprises the steps of setting at least one image and a corresponding background sound, and detecting when a user selects an image for which the background sound was set and outputting the selected image and the corresponding background sound simultaneously. The guest-host liquid crystal mainly comprises a nematic liquid crystal composition having a value of dielectric anisotropy within the range of 2 to 10, The molecules of the nematic liquid crystal are aligned vertically with respect to the upper and lower substrates. The SNR calculator obtains an average in an interval determined by accumulating an inputted inter-symbol mean squared error to calculate an SNR. The first and second pixel arrays are combined to produce a third pixel array defining a desired SAR image that shows distinct shadows of moving objects while preserving detail in stationary background clutter.