Global Positioning Systems (GPS)
Polar Grit X, Rugged Multisport GPS Smart Watch, Ultra-Long Battery Life, Wrist-based Heart Rate, Military-Level Durability, Sleep and Recovery, Navigation, Trail Running, Mountain Biking
ULTRALIGHT OUTDOOR WATCH WITH EXTREMELY LONG BATTERY LIFE: Up to 40 hours of training with GPS and optical heart rate measurement (up to 100 hours in energy saving mode), up to 7 days in watch mode with continuous heart rate measurement. At 64 g,...
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