Fitbit’s seventh activity tracker is the smallest yet, in keeping with the company’s push to make its products feel less like computers and more like jewelry. It’s not exactly fashionable, but the sleek design all but disappears on your wrist. It automatically logs activity when you’re walking, running, or biking, and pairs with an app for manually tracking water consumption, diet, and more. The sleep data and silent alarm leave room for improvement, but still, you could do a lot worse for $150. Read the full review.