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Color:black Note: This smart watch is compatible with android 4.4 above and ios 8.0 or above. The fitness watch is not intended for medical use,the date of heart rate is only for reference. How to connect with smartphone: Turn on the phone Bluetooth and tracker; Scan the QR cord(on manual) to download and install the free app "H Band"; Click APP to link your watch (Note: Please ensure the watch is not bound by other account); Time on the watch is the same as the phone after connection. Specifications: Screen size:1.3-inch Screen pixels: 240*240 Strap length: 250 mm Bluetooth:Bluetooth 4.0 Battery capacity: 200 mAh Charging time:2 hours Using time:5-7 days Standby time:15 days Package Content: 1*smart watch 1*charger 1*English instruction manual 1*box