Tomtom runner2 cardio gps watch built in heart rate monitor on your wrist allows you to run to the rate of your heart change modes so you can train and track during run bike swim and gym activities features inbuilt heart rate monitor at your wrist so no separate chest strap needed ultra slim lightweight watch designed for runners and other sports and two sizes of strap so it comfortably fits all wrist sizes real time information on time distance speed pace and calories set daily