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Message: [QUOTE="KDXDan, post: 160113, member: 20231"] PedroMx I have a Polar Protrainer NV. The NV means you can read it at night. I never use the light. All the Polars are waterproof somewhat. If use one offroad in the mud its an important feature. Don't get one that just tells you your heartrate. You have to constantly look at it and then do the calculations in your head. A buzzer (or beep) which tells you you're above or below your heart rate zone is important to me as I MTB and don't always look at it. Mine has target zones and records how much time I spent in my zone, below zone and importantly above the target zone. I wish it had maximum heartrate so I could look at it say after a MTB race and see what the maximum rate was. This is important to figure out what your correct target zones are (recovery zone, max, 70% etc). Mine also has a feature that will allow me to record laptimes. You do have to press the button every lap. [/QUOTE]