The digital watch shape that comes to peoples’ minds is “square.” This is not simply because there is an image “digital = (should be) angular”. - The display, which is made up of units each comprising seven long thin segments, differs from the analog watch - which is based on the rotational motion of the hands – in that it is square. - A square shape is convenient when making many display panels from one board. - It has been predetermined that the display wiring runs vertically and horizontally. A great many aspects of today’s digital watches are a result of having taken into consideration the efficiency in production in evidence when the digital watch made its debut. However, with the technology at that time, to manage the inner dimensions of the case with a high degree of accuracy and to tightly close the back plate, thus ensuring the waterproof property, a rounded shape that could be roundly cut was overwhelmingly advantageous; a barrel shape was widely used for digital watches to meet the two requirements that the display be square and the inner workings and the back plate round. As a result, this shape that was not only “angular” but also “somehow round” was ingrained in the collective memory of people as an icon of the digital watch. The “radio wave solar” movement is mounted in this model. This model has two functions: the “radio wave watch” receives radio signals generated by two base stations in Japan to display the correct time, while the solar cell generates electricity from sunlight. To mount a movement that represents future digital watches, a standard shape that anyone can call to mind is the most suitable.