Heart Rate & Sleep Monitoring: Tracks real-time heart rate automatically & continuously and automatically tracks your sleep duration & consistency with comprehensive analysis of sleep quality data, helping you adjust yourself for a healthier lifestyle All-day Activity Tracking ...Heart Rate & Sleep Monitoring: Tracks real-time heart rate automatically & continuously and automatically tracks your sleep duration & consistency with comprehensive analysis of sleep quality data, helping you adjust yourself for a healthier lifestyle All-day Activity Tracking: Accurately record all-day activities like steps, distance, calories burned, active minutes and sleep status Multi-Sport Modes & Connected GPS: 14 exercise modes help you better understand specific activity data; Connect the GPS on your cellphone can show run stats like pace and distance and record a map of your workout route See Calls & Messages on Your Wrist: Receive call, calendar, SMS and SNS (Facebook, Whats - App, Linked - In, Instagram, and Twitter) notifications on display; never miss the messages that matter Built-in USB Plug: Easy to charge with any USB block and computer; no charging cable and dock needed; one single charge gives you up to 7 days of working time Letscom Fitness Tracker with Heart Rate Monitor This tracker requires i - OS 7.1 & Android 4.4 above, Bluetooth 4.0 (Smartphone only, not for PC, i - Pad or Tablet) Note: IP67 water resistant, you can wear the tracker when running in rains and washing hands, but do not wear it when showering, swimming, or diving. Highlight Features: OLED 0.96 Inch Screen: View your health data on a bright and clear OLED 0.96 inch screen and customize your clock face that suits your taste. Call Alert: The tracker vibrates and call is displayed on screen when there is an incoming call.