This device not only tracks steps, distance travelled, calories burned and sleep patterns, but heart rate too. It can be synced with any iOS, Android or Windows phone, with the ZeFit app displaying long-term progress, activity analysis and daily goals. Push notifications about incoming calls and texts will be displayed on the full-colour touchscreen. The water-resistant MyKronoz ZeFit4HR comes with a long display and a narrow band. Users can switch between watch faces, and have a choice of five different strap colours. The tracker has a battery life of up to 5 days.