Razer Nabu SmartBand is small but packs a wide range of features. It tracks your exercise activity (e.g. distance and heart-beat tracking), your sleep, and your location. Pairs with your smartphone and delivers texts and email alerts. Nabu can be controlled by gestures. For example, shake your wrist to dismiss an alert. Similar to the popular Bump app you can swap data with another Nabu wearer by shaking hands. Detects other Nabu bands nearby, letting you know their location.