The current-feedback operational amplifier-based sinusoidal oscillator provides oscillations based on a single external resistor and a single external capacitor, which exploit the internal parasitic components of the CFOA. Two pins are disposed in the end portion and slideable outwardly to engage in holes provided in the projections to detachably connect the watch band to the watch case. The electrodes of the semiconductor chip are connected to the conductive wires via a bond between the chip bumps and the board bumps. The controller is configured to control the on and off gates of the switch, and the leaker device is configured to deliver power to the controller. The wheels cooperatively operate in a travel mode and spinning mode. An ink supply mechanism is operatively arranged with respect to the print head assembly to supply the print head assembly with ink.