1 USB Interface: With a USB charging port, the 40W portabel foldable solar panelcan charge the device, providing you great using experience. Application Scenario: 40W folding solar panel has a wide range of uses, making them ideal for camping, hiking, backpacking, horseback riding, fishing, or other outdoor activities. Monocrystalline Silicon Material: The portable foldable solar panel is made of monocrystalline silicon, which is durable and has a long service life. Foldable Design: Using advanced production technology, the 40W solar panel charger has a foldable design that can be used anywhere. Good Features: 40W portabel solar panel has high conversion efficiency, good output efficiency, low light efficiency, light weight, convenient carrying, and strong applicability.