PolarA(R) A370 :: Offering personalized activity and exercise guidance the waterproof PolarA370 integrates intelligent wrist-based heart rate and fitness tracking with Polar Sleep Plus(TM) analysis and phone assisted GPS. Starting with a proprietary optical heart rate solution the A370 measures your heart rate not only when exercising but also continuously throughout the day. This 24/7 tracking allows you to see how your heart rate responds to the peaks and valleys of the day. When exercising outdoors the Polar A370 can use your phone's GPS signal to track your pace distance and route. While sleeping at night Polar's Sleep Plus feature tracks your sleeping patterns and provides meaningful feedback to help you achieve your best night's sleep. Accustomed to using popular 3rd party services like MyFitnessPal? Exercise and activity data is transferred over when you connect your Polar Flow account to services like Apple Health and Google Fit. Monitor prices are too low for additional discounts or coupons to be applied.