The new Garmin Forerunner 935 is a GPS-enabled smartwatch with advanced tracking features for your complex exercise routine - running, sprinting, swimming, biking, even triathlons are covered by this $500 watch. Its lightweight shell (49g) keeps out of the way and the battery lasts up to 2 weeks in watch mode. You can change teh QuickFit bands from the silicone ones to dressier leather or metal in between training. The battery lasts a full 24 hours in GPS tracking mode, so even if you go for a run every day, you will not have to charge the watch that often. And you'll get tons of data...
Source: http://www.gsmarena.com/garmin_forerunner_935_smartwatch_is_an_advanced_onwrist_coach-news-24282.php