The Suunto SMART HEART RATE BELT chest belt provides accurate information about your heart rate without compromising comfort. Its use is especially suitable where wrist heart rate measurement cannot be used or such measurement does not offer sufficient accuracy. For example, when riding a bike, where the watch is placed on the handlebars, when swimming, or during combat or contact sports. In addition, the Suunto Smart Heart Rate Belt features an internal memory which is activated when the belt is out of range of the paired watch. This is particularly useful when swimming or in moments when you want to have an overview of your heart rate frequency but you cannot be wearing the watch on your wrist or you just don’t want to. The memory function is supported by the Suunto 3, 5, 9, Spartan, Ambit 3 and Traverse watches. The Suunto Smart Heart Rate Belt is a great companion for the Sports Tracker training app, which is available free of charge for Android, iOS and Watch OS devices.