Video shot/edited by Jennifer Hahn. (video link) Making an accurate wristband heart rate monitor, let alone one that's also comfortable and stylish, is challenging. Fitbit's latest attempt to strike that balance is the $150 Alta HR. A near mirror-image of the original Alta, the Alta HR is an updated model with slight design differences, improved sleep-tracking features, and a tiny optical heart-rate monitor inside of it. The Alta HR is quite similar to Fitbit's currently available Charge 2, but the Alta HR places more emphasis on the combination of a slim design and an accurate heart-rate monitor.