The doppler fetal heart rate monitor can be used on expectant mothers carrying as early as 10-12 weeks old fetus to the moment you are about to give birth. So the first bond you would create with your child would start the moment you make contact with through the doppler fetal heart rate monitor. The doppler fetal heart rate monitor lets you know and hear the heart beat of the baby inside you while seeing the digital result on an LCD screen. The electrical stimulation provided by the fingers that is sourced from the heart gives the strapless monitor the right reading on the heart rate. What is good about the strapless heart rate monitor is that there is no need to strap a transmitter around the chest, which might be an inconvenience for some especially on the ladies since most heart rate monitors are designed for men. It can also be used anywhere you go whether driving your car or taking a walk to the park. For Reebok heart rate monitors are usually worn on the wrist, there are several features to add more functionality on the device. These include calendar, time of day, the current, lowest, average, and maximum heart rate, plus the percentage of the maximum heart rate, target zones, exercise functions, and more. The electronic impulse coming from the finger would be the source of data that the heart rate monitor would use to determine the heart rate. Since this is the process, the Reebok strapless heart rate monitor provides an in demand only reading. This is different from the usual chest worn heart rate monitors that would give heart rate reading from start to finish. Memory: To be able to record the data of your previous training, you should need a heart rate monitor that has a good memory storage capacity. It is important to note that the lesser memory size can normally record 1 to 2 training sessions while heart rate monitors with large memory storage can record multiple heart rate data. Another good thing about the Timex heart rate monitor particularly on some specific models is the Timex Bodylink system. Other heart rate monitors use speed sensors to calculate speed and distance. But the with eh Timex Bodylink system, the distance and speed is calculated with the use of GPS satellite system.