This is the first wearable ring that has an optical heart rate sensor built into it. It tracks your activity, heart rate and sleep. It’s presumably more comfortable to wear to bed than a smart watch or other wrist-bound devices. Another plus is that you don’t have to take it off in the shower — it’s waterproof up to 5 ATM. The only time you’ll have to take it off is to charge the device every five days or so. The Motiv Ring can be pre-ordered now for $199 and is expected to start shipping in summer 2017.