A guiding device is provided for guiding a conducting wire extended out from an electronic device to be soldered on a printed circuit board. In addition, a ticket printer is coupled to the microprocessor for printing a ticket that includes pending credit indicia and pre-loaded ticket validation indicia in response to a cashout signal on the cashout signal input. The transmitter input stage includes a trimmable resistor, one end of which is coupled to a positive transmit input signal, and the other end of which is coupled to a negative transmit input signal. The injector includes an annular adapter for spacing the injection orifice from the skin of the patient. The capacitor is thereby discharged via the discharging path to avoid the incorrect display picture problem due to an insufficient discharge when the display frame is being changed. Upon detection of a variance in the environmental condition during movement of vehicle, the face recognition standard is updated with a corrected face recognition standard corresponding to the environmental condition with the variance.