I have a Polar F4 HRM--it's about $100, I think, give or take $15. It does have a chest strap, but it tracks heart rate and calories--and it bases the calorie count on your HR through the workout, and on your height, weight, age and gender (you program this info into the HRM when you take it out of the package). I think if you have an HRM that keeps constant track of your HR and requires you to enter all the information about yourself, it'd work just fine (I don't know if the MIO has you enter that information). I think that Polar has different sized straps you can order--The one I have is "Medium" and the adjustable strap could double the size I need to use it. I don't know anything about the MIO, though.
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