I bought this product aware of its limitations, so no complaints about the functionality. The heart rate belt can even be connected to a smart phone (of course, losing the ability to connect to the watch.) I would rate it 5 stars, but... The right lower button became wobbly and started making an alarming clicking sound indicating it may fall out of the watch. And that just after few usages, once in the pool with my kids and a couple of times on a bicycle. Will see how durable it is.