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M4 Smart Watch Sport Wristband Heart Rate Fitness TRA-CKER Waterproof Bracelet Specifications: 100% brand new and high quality Comfortable to wear, great for indoor or outdoor activities With reliable blood pressure and Heart-Rate-Monitor function, learn more about your body Perfect gift for your families and friends Material: Plastic+Silicone Color: Black Case Size: 19*11mm Band Length: 260mm Display: 80*160 Battery: 105mAh Waterproof: IP67 Compatible with Android and iOS Package Include: 1 x Smart Watch 1 x Charging Clip Note: Please allow minor error due to manual measurement. The colors may be a little difference for the different monitor display.