This is one of the few heart rate monitors that doesn't require a chest strap. It must have been one of the first, if not the first heart rate monitor to use optics for detection and not require a chest strap. They do this by shining some light onto your skin with LEDs and using a light sensor to detect the slight reddening of your veins and capillaries when your heart is beating. It also has an accelerometer that can be turned off if you're only doing a few puffs and just want to calculate calories from heart rate alone. Count calories burned as fitness beats and its clones. The downside, however, is that they don't have a watch function and they're not as small and aesthetically pleasing as earbuds, so you probably won't wear them all day. Fit is something more for people who like to wear workout clothes all the time just to make others think they're athletic. This device is more for people who are serious and want to know exactly how many calories they're burning, stay in their target heart rate zone, and hate wearing that horrible chest strap. A week ago I saw another monitor with an optical sensor in a store. Hopefully, as technology advances and is accepted, it will become smaller and more accurate when worn on the wrist. Fit people still prefer their expensive pedometer, which tells them they've burned 568 calories by tapping their fingers on their desk at work. However, I find that I like my treadmill better because it tells me I've burned 450 calories when this machine bursts my bladder with the more accurate 398 calories.
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