The sigma pc311 heart rate monitor is perfect for the ones who want to begin heart rate based trainings it ensures ecg accurate readings and has a clear display with large numerals this entry level heart rate monitor is equipped with a stop watch and is ready to use with a press of a single button it offers the stopwatch function when the chest belt is not worn and has a clock function this high quality device features a stylish sporty design and comes with a 1 year warranty