SII was founded in 1937. In 1970, the world’s first quartz watch was introduced, marking the beginning
of the company’s research, development, and production of products such as quartz oscillators and micro batteries.
SII employs high-precision PEQ technology, which enables simultaneous machining on both sides to ensure
a high degree of dimensional consistency in its products.

If you are interested in the products, please contact：SII.Marketing@weltronics.com