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A smart, intuitive training computer for runners and cross-training athletes, the Polar RS300X wrist heart rate monitor helps you to train at the right intensity with personal training zones. It's compatible with Polar's S1 foot pod and G1 GPS sensor (both separately available), enabling you to combine heart rate with speed and distance and truly make sense of your training. Committed runners will find the most value in the real-time pace and distance measurement of the S1 foot pod, while those who mix up their training regimen with cycling, inline skating, paddling, mountain biking or hiking will be best served with the speed and distance G1 GPS Sensor. It comes with the Polar WearLink+ 31 coded transmitter (with changeable battery).Please refer to User Manual. The RS300X helps you to train at the right intensity with personal training zones. .caption { font-family: Verdana, Helvetica neue, Arial, serif; font-size: 10px; font-weight: bold; font-style: italic; } ul.indent { list-style: inside disc; text-indent: 20px; } table.callout { font-family: Verdana, Helvetica, Arial, serif; margin: 10px; width: 250; } td.callout { height: 100 percent; background: #9DC4D8 url(https://images-na.ssl-images-amazon.com/images/G/01/electronics/detail-page/callout-bg.png) repeat-x; border-left: 1px solid #999999; border-right: 1px solid #999999; padding: 10px; width: 250px; } ul.callout { list-style: inside disc; text-indent: -12px; font-size: 12px; line-height: 1.5em; } h5.callout { text-align: center; }