Perché mettendo fianco a fianco un iPhone e un Android c'è una differenza di 15 secondi tra gli orologi? - Quora
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Amazon.com: Fitness Tracker, Smart Watch [24h Accurate Health Monitor with 5ATM Waterproof] Smart Watch for Heart Rate, Blood Oxygen, Sleep, 1.7'' Touch Screen Fitness Watch for iPhone iOS Andriod, Black : Sports
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