N&S Waterproof Fitness Tracker - Black Fitness tracker: Keep track of your daily activities (steps, sleeping quality, calories). You can set clocks with slitly vibrate (wake up time, meeting time, dating time, Sedentary reminder) Digitize your life Heart rate monitor:Monitoring your heart rate effectively and being reasonable to planning the movement. Please refresh the app so you can see the updated data. Remote camera control:The device key can control remote photographer shooting Anti-Lost:when the smart phone is beyond the bluetooth range (no more than 5m),the device vibrates to remind Sleep Monitor:automatically recognize your status and monitoring the whole sleep progress with analyzing the deep sleep and Shallow sleep hours