The Sandberg Solar Charger 21W is a top-notch portable solar panel that efficiently converts sunlight into electricity. The device features two USB ports, allowing you to charge various USB devices such as smartphones, tablets, and power banks. You can also connect a power bank to the solar panel to store energy for later use or use it as a charging intermediary if your power bank supports simultaneous input and output. The solar panel comes with four hooks, enabling you to attach it to your backpack during hikes and adventures. This allows you to charge your devices with eco-friendly solar energy wherever you go. The Sandberg Solar Charger is designed to withstand demanding conditions. It is IP67 certified, meaning it is waterproof and completely dustproof. Additionally, it has a waterproof pocket that protects your devices and cables from moisture. The solar panel is also foldable, making it easy to pack and carry with you. Portable and powerful solar panel Double quality assurance 2