| 摘要 |
PURPOSE:To eliminate the connecting line of a revolution detecting means and a main body and to improve convenience for use by operating speed based on the radio signal of the revolution detecting means, providing the main body to display on a display part and a mounting means mounted on the wrist of a driver freely attachably and detachably and selecting the display of the display part to speed display and to time display. CONSTITUTION:A main body 8 is mounted on wrist it is used as a wrist watch when speed display is not necessary and the display of a display part 12 of the main body is changed from time display to speed display by a selecting means 13 corresponding to necessity. Then, the detecting signal of a revolution detecting means 3 of the wheel of a bicycle is outputted to the main body 8 as a radio signal. Accordingly, a connecting line to connect the revolution detecting means 3 and the main body 8 is unnecessary and even whn the main body is mounted on the wrist, it does not become the obstacle of the driving of the bicycle. Thus, convenience for use can be improved. |
