There are multiple problems with this extremely over-priced watch. Most importantly, the heart rate monitor becomes useless once you start to workout and sweat a little. And no matter how you attempt to reposition the watch or attempt to get a read, will result in a positive readout. Then, when you are not actively working out, the watch will constantly be beeping, as the slightest change in position or glancing touch with your skin will result in an attempted heart read. This persistent checking when you DON'T need it is annoying and at times has made using the other functions difficult. Speaking of which, this is NOT a user friendly device and the function buttons are NOT intuitive. I've never struggled before using a stop-watch function, but somehow the geniuses at Sportline have made it complicated. The only positive function I could find in the watch is the pedometer. I strongly advise against purchasing this product.