Heart rate is the number of heartbeats per unit of time, typically expressed as beats per minute (bpm), which can vary as the body's need for oxygen changes, such as during exercise or sleep. And here we are pleased to recommend this Multi-function Heart Rate Monitor Calories Watch to you. This Heart Rate Monitor Calories Watch is widely used in sport fields. The accuracy of this Multi-function Heart Rate Monitor Calories Watch is about 95%. This Heart Rate Monitor Calories Watch features steps, distance in miles, calories. Also this is a multi-function Heart Rate Monitor as it can be used in pulse rate detecting, sport time counting, personal physical data inputting and so on. With this Multi-function Heart Rate Monitor Calories Watch, you can obtain the data about your heart rate and get the certain information of your body heath without any other medical equipment. It is sure to bring you a better life.