This is another sleep-tracking wristband, but one that has a couple of tricks up its sleeve. It uses watch batteries that last for over a year – most activity trackers need recharging once or twice a week. It is also waterproof. Press a button to enter sleep mode and it tracks your movement overnight, producing a graph of your sleep each morning. It’s a good products, as they all work with the same Garmin Connect mobile app (iOS and Android).