The $150 Fitbit Charge HR doesn’t look like much, and that’s generally a good thing. It’s a nondescript band (I tested the black one) you wear on your wrist 24 hours a day.

The new Fitbit Charge HR has got a lot of competition in the increasingly crowded fitness tracker market. ... There's also an issue with the strap coming undone and you wouldn't even feel it.

The piece that secures the extra strap piece has an extension that helps lock the band onto your wrist. ... Fitbit Charge HR Contributor's rating: 9.5 out of 10. Fitbit Surge Specifications.

The Fitbit Charge HR, on the other hand, is a few steps behind on the design front. It sports a rubbery strap that doesn’t feel as nice as the Charge 2.

We regularly wear a heart-rate monitoring chest strap, so on one run we used both the Charge HR and a chest strap (paired to a Garmin cycling computer) to view both readouts concurrently.

Fitbit showed off three new activity trackers this week; two fitness bands, the Charge and Charge HR, and one smart fitness watch with built-in GPS, the Surge.