This heart rate monitor I bought for indoor use. The pulse belt fits perfectly even with burly figure and is large enough. Only the reception of the pulse signal is easily be interfered with. This means that the clock is more than an arm's length from the pulse transmitter removed, it indicates no pulse.
Furthermore, I have found that the pads of the pulse belt but must be well moistened. The example is not the case with a Polar belt. For this, however, the price is really very good and I am satisfied with this product.