specifications: Watch Head Head Size:48.1*44*6*14mm Band width:22mm Screen Size:2.19-inch HD bezel-less fully laminated large screen Resolution:240*296 Touch Type:COB Full Touch Interaction Front Shell:Zine-alloy Back Case:IML Straps:silica gel Number of keys:two buttons (1 side button, 1 Rotate button) CPU:JL7011 G sensor:SC7A20 HR sensor:Tianyi Hexin HSR3300 BT version:5.3 shake:Flat motor Battery:150mAh lithium battery Standby Time:4-5 days Working Time:1-2 days Charging way:Magnetic suction charging wire SRAM:256KB FLASH:64MB Mobile system support:Support Android 5.0 or later