You have a chest strap that picks up your HR (from two electrical pads on the back); it transmits a radio signal to the watch, which reads out your HR.
You can get more complicated ones ("coded") which transmit a radio code rather than a pulse, so it doesn't get confused if someone is near you wearing a monitor (the uncoded ones can get very upset in a gym, and start adding your HRs together etc!)
You can get watches that beep, or flash, for your target zone - personally I just try to have a look at mine as I'm going along to see the actual HR rather than just a more vague zone.
Would certainly recommend; but you can probably get away with one of the cheap ones as all the extra functions you get (stopwatch, count calories etc) are generally less important and make it quite a lot more expensive. The only thing I'd consider perhaps useful is the ability to record; but to be honest I only use it because we were made to buy the recording model by our coaches...
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I can't understand why people are frightened of new ideas. I'm frightened of the old ones. -- John Cage (1912 - 1992)
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