This product is made by PET lamination solar panels with rainproof fabric materials, it's lightweight, very suitable for using outdoor, or remote areas.
To operate this charger is simple, please just open it up, and face the solar panel to the sunlight, then connect the charger USB junction box to charge controller, and your power packs, or cellphones.
It has a DC 18V cable, and three 5V USB ports junction box, it can deliver stablized charging current for the 5V devices and direct charge for 12V batteries.
The charging time will depends on the solar radiance, for the areas with very good sunlight, the maximum charging current can be 3.0A-4.0A.
There is no battery included in the product, so it cannot work in the darkness, or store any power in itself.