| The Polar Fitness Line Features and Functions |
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M21 | M52 | M91 | M71 |
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| Sark Products Price | $49 | $74 | $99 | $149 | $119 | $139 | $229 | $189 |
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Older Models (2000) Newer Models |
Newer Models (2001) | ||||||
| Wireless ECG Accurate |
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| One Piece lightweight Chest Belt | |
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| Coded Transmission | - | - | - | |
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| Water Resistant to 20 meters | |
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| Large LCD Display | |
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Dual | Dual | Dual | Dual | Dual | Dual |
| Hi/Lo Target Zone Settings | - | |
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| HR Limit Settings (Beats) | - | 5 | 5 | 1 | 1 | 1 | 1 | 1 |
| Out of Zone Alarms | - | |
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| Records Quality Exercise Time | - | - | |
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| Displays Exercise Time | - | - | |
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| OwnZone | - | - | - | |
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| Calories of the Active Exercise | - | - | - | |
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| Calories burned from fat | |
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| Calculates VO2 Max | |
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| Displays average heart rate | |
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| Profile for 2 people | |
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| Titanium Case | |
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| Time of Day / Alarm | - | |
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| Stop Watch Function | - | - | |
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| Backlight Display | - | - | |
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| Handlebar Mount | Opt | Opt | Opt | Opt | Opt | Opt | Opt | Opt |
| Slim / Hi-Tech Receiver Design | |
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| Sark Products Price | $49 | $74 | $99 | $149 | $119 | $139 | $229 | $189 |
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