I have a problem with my polar s720i. My problem is that I can't find a way to get the monitor to beep when I'm out of my target hr zones. I've heard that the alarm doesn't work when I'm on my bike, but it should be ok when the bike mode is set off I can't find an answer to this from the manual and I'm starting to think if it's possible at all. Has anyone else had the same problems? I'd really appreciate if someone could tell me how to enable the alarm (or tell me it's not possible so I could stop worrying about it )