i7 Pro Max Smartwatch 1.54 inch Calling Option BlackModel: I7 Pro MaxCase: AlloyStrap: siliconeMain screen: 1.54 high-definition screenBluetooth: support Bluetooth call musicBT:4.2Battery: 220mAh lithium ion battery,Longer battery life Standby time: About 2 daysUse time: About 1-2 days Ho..