The polar m400 with hrm is a smart running watch that can pair with your phone to receive alerts incoming calls text mesasges and push notifications from social media apps as well as keep you active through out the day and record your data the watch features an advanced gps that keeps track of your pace distance and altitude the m400 tracks your steps activity and calories 247 and encourages you to stay active everyday plan sync and share your training usnig the exclusive polar flow onli