Heart Rate Monitor

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Could someone be kind enough and explain to me what it is, and how it works. I would like to purchase one, with the calorie counting, so i know exactly how many cals. I am burning everytime I exercise. I go to Curves Womens gym, and they do not have the Curves Smart program. When I log on here, it is telling me I am burning about 190 every 30 minutes. I mean, thats a good amount, but for some reason.. I REALLY feel like im burning at least 230 a workout. For anyone who is an expert from Curves, or calorie counting. I am 16 years old, 5'2 and 171 pounds. (yes dont look my age)
-Where did you get yours
-How much
-Trustworthy?

Ya know, the basics. Thanks a lot!

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