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Three predefined battery modes Performance Endurance and Ultra deliver from 25 hours to up to 120 hours* of recording time with GPS tracking on. When you start a recording youll get an estimate of how much battery you have left with the current mode. If its not enough switch to another mode at any time. On long ultra runs battery life is often the limiting factor for recording distance and track accurately as GPS is a heavy drain on the battery. Suuntos unique FusedTrack algorithm combines GPS and motion sensor data to improve track and distance accuracy. This allows you to extend battery life by lowering GPS power without significantly compromising accuracy. Suunto 9 is designed and built to meet the demands of professional athletes. Tested to the extreme with thousands of hours of real use in the toughest conditions by Suuntos internal testing team and athletes all over the world it is your trusted companion to confidently see you through any adventure! Pair Suunto 9 with the new Suunto app to track all your adventures as well as follow your long term trends including daily activity and sleep. Easily share your greatest achievements and connect with others in the app community.