Stylish and waterproof activity tracker that makes you move. This elegant wristband tracks your daily activity and even monitors your sleep. Loop 2 motivates and guides you towards better fitness and health. Rechargeable 38 mAh Li-pol battery. Battery duration up to 8 days with 24/7 activity tracking and 1h/day training. Connectivity: Easy wireless sync via Polar Flow app with Bluetooth Smart, Custom USB connector for charging and data sync with PC or Mac via Polar FlowSync, Polar Flow web service compatibility with Mac OS X 10.6 or later and PC Windows XP, 7, 8, Mobile phones running iOS10 or later and Android 4.4 or later, Updatable software - UI languages in Polar Flow: English, Spanish, Portuguese, French, Danish, Dutch, Swedish, Norwegian, German, Italian, Finnish, Polish, Russian, Chinese, Japanese. With soft silicone wristband: Weight: 38g, Thickness: 10,8mm, Width: 20mm, Size: 145-240mm. With TPU wristband: Weight: 36g, Thickness: 10,5mm, Width: 20mm. Colour: Pink