... , Mp3, Mp4 3, USB 4, outdoor thin film solar panel1, portable solar film panel2, apply for mobile phone, laptop, PC, ... manual, in order to use the constant Kay solar cell1, applications: for handheld devices and battery charging, such as MP3, mobile ... weather, seasons, equipment and other factors TroubleshootingI, check the solar power panel and device connection. See operation schematic diagramJ, ...