Suunto Foot Pod: Just motion activated, by pushing a single button on your training watch, you immediately get your speed and distance and pace on your Suunto T3, 4 and 6 products. Water resistant to 10 feet and a user changeable battery. We feel that this is a much more accurate measurement of speed and distance and GPS for running applications. Another advantage is battery life exceeding 99 hours, the fact you can run indoors, run between buildings, under thick overhead coverage and you will not lose your signal. The Suunto Foot Pod, for accurate, easy running