Mayo has long occupied the sales championship of chestless heart rate monitors in the United States. In 1999, Meo invented the braless strapless heart rate monitor, which was named the best product by Consumer magazine in 2008, and its Mio Alpha won the ISPO (the world's largest sporting goods show) "Product of the Year" award in the fitness category, and the CES (International Consumer Electronics Show) Design and Industry of the Year award. Its principle is to detect blood data under the skin through a dual-beam optoelectronic element, and the accuracy is basically the same as that of the traditional heart rate band. For outdoor watches, the function of Meo is relatively simple.