Sontuo was born in Helsinki, Finland on 1936. It is the design and manufacturer of wrist computer, the world's top sports measuring equipment in the fields of mountaineering, hiking, orienteering, diving, skiing, cycling, triathlon, navigation and golf.

2. Tianmeishi

Timex, founded in 1854, is an American watch brand, which is famous for its long watchmaking history and fashionable appearance, but emphasizes practicality. Timex's sports watch was rated as the simplest sports watch, without fancy and complicated design, even children can easily control it.

3. Jia Ming

Jiaming, founded in 1989, has been committed to the design and development of GPS products for a long time, and has a simple and firm belief: to provide innovative and convenient products and improve the quality of life of customers, so it has become the leading brand of global satellite positioning and navigation system.

4. Polar regions

Polar Boneng watch is a kind of sports watch in Finland. It is one of the most common instruments in China sports, and it plays a very important role in the training of various sports. Polar Boneng's top sports heart rate watch series provides different and personalized product solutions for different characteristics and needs of different groups of people such as health care, fitness, fat reduction, running, cycling and outdoor mountaineering.

5. Maiou

Maiou's most famous heart rate meter can be said to be a good helper for daily exercise and fitness. The operation is simple and convenient, which can help us better carry out daily exercise and fitness, and feedback your body information in real time. There are five kinds of timing settings to meet the needs of daily life.