The solar panel convert solar energy into free electrical energy. Adopts double USB output design, which can charge your various mobile phones or other electronic devices. Monocrystalline Silicon Material Conversion Energy Efficiency up to 19%Longer service lifeCorrosion resistance 5V/0-2600mA With 2 USB output ports, built-in voltage regulator, the charging efficiency can reach 5V/0-2600mA Take it with you Mini size and lightweight design can be put in a small bag.Easy to carry, ready to prepare needed from time to time. The mini ring solar panel is packaged with high-quality film, which has good waterproof performance, can withstand harsh weather conditions, and is resistant to severe cold and heat.