M3 BAND Help you keep fit: it learns your activity level including amount of steps, mileage, heart rate, and records calories burned throughout the day, Monitor your sleep: You can get SMS message, incoming calls and calendar alerts when you are working out. You can also set the drinking or sedentary reminder. IMPORTANT NOTICE (How to Use Device) Download YOHO Sport "App" please go to "Play-store" or "SmartPhone Store", search "YOHO Sport", then download. Before going to connect your mobile phone with fitness band Bluetooth must be open. Also, full charge your device before using.