... than 500 timesColour:blackKey feature :1,Piano baking finished,Double usb out put , can charge two mobile ... ,Can charge at any condiction, charging: use usb power supply , Connect the data line with ... the mobile device .Product introduction:Key function:Double usb out put , can charge two mobile devie ... , Can charge at any condiction, charging: use usb power supply , Connect the data line with the mobile ...