The present invention relates to novel fluorinated piperidine derivatives having antagonistic activity at the 5-HT2B receptor, pharmaceutical compositions comprising these compounds and their use as a medicine. The first end has a base surface, and at least one clip extends from the body towards the second end. The touch panel controller decides an order of driving the detection-scan electrodes in each detection frame cycle according to predetermined phase-delay and phase-advance positions with respect to a display-scan electrode drive position of the display device so as to correspond to an order of the detection-scan electrode array of the touch panel. When characteristics of reflected illumination received by the imaging reader indicate the presence or movement of an item in the visible scan zone, the visible light source may be triggered to illuminate the item and thereby facilitate reading of the symbol using the same imaging reader as is used to sense the presence of the item.