Suunto GPS POD uses GPS signal to track your speed & distance while training outdoors. Features Wireless sensor that uses a Global Positioning System to track speed & distance across wide variety of outdoor activities Fast & easy to attach with clip or armband (included in the package) Battery lifetime > 10 hours Interference-free ANT Transmission Technology Water resistant to 1 m / 3, 3 ft Lightweight (only 72 g with batteries)