Newer version could have little difference with the discounted unit. Discount heart rate monitor in this case may be an old stock but still fully functional complete with features that are right for your needs. You just have to bear with it but who cares, as long as it is discounted and suite your need it is always okay. The liquid is applied on the mother s belly that would let the sound waves to travel from the heart of the baby across the belly through the monitor. 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, every effort the user would make would mean greater effectiveness on his part. The heart rate monitor watch would even be very effective on regular people who just want to see on their will the status of their heart even if they are not in training or running. Now, people on their way to the office or people waking up early in the morning can access instantly the status of the heart accurately and conveniently. The strapless heart rate monitor requires no strap to wear around the chest which in turn would provide more relaxed and comfortable feel during training. It uses only the wrist-worn device that reads the electronic signal released by the heart through the fingers pressed on the device for a given length of time. The transmitter is the one that is worn of the chest. It is also called the chest strap. It transmits the heart rate reading to the receiver which gives the heart rate reading to the user. The receiver is a wrist-worn device. This has several functions and features including the ability to send several exercise data like calorie burned, percentage of fat burned, and more to include time telling. With the heart rate monitor, the intensity of training is regulated to get the best exercise or training possible with the least amount of effort. If there is over-training, there should be under-training. Like the former, the latter usually happens, as the right amount of intensity can never be accurately monitored.