Sigma

https://sigmasport.com/
Sigma Sport is a renowned German manufacturer of high-performance cycling computers, bike lights, and heart rate monitors. Established in 1980, Sigma Sport has a rich history of innovation and craftsmanship, having pioneered the development of electronic cycling products that have enhanced the cycling experience for over four decades.
Sigma Sport’s origins can be traced back to the early 1980s when Klaus and Karin Petzold, passionate cyclists and electronics enthusiasts, recognized the need for more accurate and reliable cycling computers. With their expertise in electronics and design, they began developing their own cycling computers, quickly gaining recognition for their precision and ease of use.