Polar A360 Fitness Tracker Accurate wrist-based heart rate Monitor with personalized training guidance and 24/7 activity tracking. Tracks workouts, sleep quality, steps, distance, calories burned, activity and more. Waterproof wristband has a secure buckle for a comfortable fit. Interchangeable color wristbands sold separately. Bright Colorful touchscreen, Vibrating Smart notifications and motivating inactivity alerts help you stay active. Plan, sync and get feedback with the Polar flow web service and app. Android and iOS compatible.Please refer user manual attached below for instructions and troubleshooting steps.