In addition to all the H7 features such as syncing with a free Polar app and displaying your workout data in real time, you also have a changeable wristband options, sleep monitor, free polar web service, daily activity goal and guidance, steps and distance, and vibrating activity alerts. Both your phone and/or watch will display your real time heart rate and calories burned. It also can map your route and shows you what zones you are working out in.

It's a great product and very simple to use.  The band links to most gym equipment. Having both the watch and band give you the option to workout with or without your phone.  You'll love this product.  
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$135.51

A300 HR Watch & H7 Heart Rate Bluetooth Smart Sensor