The first performance heart rate monitor in a wrist band that transmits continuous heart rate data to fitness apps and sport devices the mio link features a comfortable sleek design with its soft silicone strap available in two sizes to fit a wide range of wrist sizes bt40 and ant transmission to mobile apps and sport devices works with miogo fitness app to be released in conjunction with mio link one button quotstartstopquot and quotsyncquot activation tri colour led