The Polar A370 features an optical heart rate monitor, also measures speed and distance, and offers smart notifications for your incoming calls, messages, e-mails, and calendar events. The device observes the length and quality of your sleep and notifies you of inactivity. Compatible with: MacOS X10.6 or newer, Windows XP, 7, 8, 10, mobile phones running iOS7 or newer, Android 4.3 or newer, smart scales Polar Balance; Polar H10 heart rate monitor; Apple Health Kit, Google Fit, MyFitnessPal and MapMyFitness services.