Heart Rate Blood Oxygen Track Fitness Multiple Sports Mode Built-in GPS All-day Activity Tracks daily activities such as steps, calories, heart rate and sleep. It has a built-in TRUE GPS which provides you real routes on the map when you exercise outdoors. Altimeter Great function for hikers and mountaineers measuring their way up. Blood Oxygen Blood Oxygen sensor tracks your oxygen level through out the day for a better healthier exercise. Sleep Monitor Monitor your REM when you wear it to sleep. It will tracks your rapid eye movement to provide better sleep data. Water Resistance 5 ATM professional water resistance for swimming, showering, snorkeling and rain. AMOLED Display The Vibe PRO maximizes the screen size to 1.78” and uses high resolution AMOLED screen for a better swipe and touchscreen experience. Notifications Receive and read text messages, social media notifications, calendar alerts, incoming calls to never miss an important moment.