NOCO XGrid FLEXUSB 5V 1A Flex Regulator Innovative; Micro-controller for charging all USB devices, including, smartphones, tablets, Ereaders and more Precision charging; Includes pulse-width-modulation for the fastest recharge time possible; Designed for safety; The safest solar charging solution with reverse polarity, spark-proof, overcharge, over-current and short-circuit protection Power indicator; LED indicator lets you know when the solar panel is generating power Modular Design; Plug-n-play technology with all NOCO XGrid Solar Panels