Built-in 6V4ah rechargeable sealed lead-acid battery Wide voltage range 110-240V,50/60Hz Charging time 13-15 hours Using 9V 3-7W solar panel(max input less than 7W) DC 6V Output(can charge up to 4 items at one time) USB mobile phone charging function, build-in CCCV system to charge GDLITE Solar Home Lighting System is compact, portable and easily mountable in an easy-to-install kit. Solar Panels: This is 9V, 3.5 watt strong aluminum framed solar panels with 3 Meter long copper wire are solid-sta