Released in 2001, the WVA-300 succeeded in becoming the the world’s first radio-controlled watch that indicates accurate time by receiving standard time radio signals, and was powered by a solar cell. The watch shattered the common sense of the industry, which had believed it was not possible to build an advanced-function watch using solar cells. This watch features low power consumption and miniaturization enabled by technological developments such as an energy-saving CPU based on a SOI (silicon on insulator) format, and a super-miniature detection IC.