Smartwatches can track your health stats, but they also do a lot of other things you might not always want or need. The $100 Fitbit Air tracker ditches the screens that have become common on people’s wrists, leaving behind a tiny puck of health sensors you can often forget you’re wearing. You will not, however, forget that Google’s new health platform is built around AI. The Air has no speaker, and there’s only one LED on the side to indicate battery level