The doppler fetal heart rate monitor uses high frequency sound waves that lets you hear the sound of your baby s heart beat through an audible device sometimes an earphone or a speaker that is usually built-in on the heart rate monitor. In order for this wave to travel, the doppler fetal heart rate monitor is aided by particular liquid often a lotion, oil or water. The heart rate monitor watch can tell if the user have to slow down of speed up his activity. As a result, the user can eliminate the risk of over-training or under-training which is very possible without a heart rate monitor watch. So, every effort the user would make would mean greater effectiveness on his part. This is because the strapless heart rate monitor requires the user to place two fingers on the monitor s sensor in a specific length of time usually between 4 to 13 seconds. And the reading would only activate if this is done. The electrical stimulation provided by the fingers that is sourced from the heart gives the strapless monitor the right reading on the heart rate. Many treadmills today has a built in heart rate monitor. The function conforms to the general use of a heart rate monitor. It keeps you on tract with your heart rate while doing your exercise on the treadmill. It eliminates the need of checking your pulse manually which is often inaccurate and hard to do. The complete line of Polar heart rate monitor today proves that the company is committed in giving every trainer, athlete, and fitness enthusiast the reason to keep on staying active. The Polar heart rate monitor answers the needs of every heart rate monitor user. Polar has specific heart rate monitors for specific activity such as fitness, running, cycling, outdoor, team management, healthy living, and weight management. 5 Advantages of Wristwatch Heart Rate Monitor Heart rate monitor has been around for quite some time but during its early years, it does not create much impact in terms of popularity and functionality. Not until technology backed up the device. Today, heart rate monitor is more popular than ever. And its patrons are from people who want to be more precise in monitoring their heart rate for more efficient training, to people who simply want to enjoy the functions of the device.