I bought this product because the description it has several features that I wanted to use, but the only function that really work well is the clock function.
The function of monitoring the heart rate is a total desaster. It does not work even when there is no other equipment around, can not be battery problem because it is new, I just bought and the belt is well placed on the chest. After about 10 minutes of use it begins to show the heart rate totally wrong, if I remove the belt and put it back again It shows the correct frequency, but after 5 seconds the problem happen again. There is also a worst detail, the protocol used to measure the frequency between the belt and the clock is not compatible with the equipment market (eg bicycles), as the Polar monitors. Well if I had the opportunity to return the product I'll do so.