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　　The Polar RS300X wrist heart rate screen is developed to assist you to train at the right intensity using core metrics such as heart rate, speed, distance, calorie, and rate burn. Advanced functions include Polar's special OwnZone-- for customized zone training by heart rate or rate, a fitness test, and car lap divides, which show average heart rate, rate and distance per lap. Athletes can easily examine as much as 16 past exercise files to check their progress and ensure they're staying on track with their fitness or training strategy.

　　The addition of the G1 GPS sensing unit to this plan allows you to incorporate heart rate with speed and range to truly understand your training. The G1 sensor is perfect for athletes who blend up their training program with biking, inline skating, paddling, mountain cycling and/or hiking. The RX300X comes with the Polar WearLink+ 31 coded transmitter consisted of with an adjustable battery and is likewise suitable with Polar's S1 foot pod.