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Description: Bluetooth Version: 4.2 Screen touch: 1.3 full round screen full touch Mode of operation: full screen touch Appearance size: about 49*52*12MM/1.93*2.05*0.47IN Material: zinc-magnesium alloy Battery capacity: 250 mAh Product weight: about 59g Wireless distance: 5m -10m (inclusive) Waterproof rating: ip68 Wristband material: food grade two-color silicone Features: HR monitoring, sleep monitoring ,information push,...