Always be prepared to charge your devices when on your next adventure. Features: 20000mAh large cell capacity Built-in intelligent IC chip can automatically identify the charging product and convert it into the corresponding current and voltage The use of industry-leading high-density lithium polymer cells makes it more compact and has a larger capacity High-quality, high-density battery can support thousands of charge cycles Compatible with 99% of electronic products and equipment on the market Solar power bank has 5V2.1A high-speed fast charging USB output interfaces and is able to fully charge your mobile device more efficiently. Materials The Solar charger power bank is made of environmentally friendly silicone, high-strength ABS and PC materials, with a protective cover attached to the outside of the charging/discharging port, which is waterproof, dust-proof, and drop-proof, very durable. It can still work normally in various harsh environments. It also comes with a carabiner that you can attach to your backpack while hiking and charge this power bank with solar energy. Mobile power supply equipped with two ultra-bright LED headlights. Double click the power button to turn the flashlight on. Double click again to turn the flashlight off. This is a very useful extra feature, whether you are experiencing a power outage or outdoors. In addition, the mobile treasure also has a built-in high-precision compass, which has been accurately corrected before, so that you will never get lost when you are outdoors. Solar charger is mainly charged via USB, but can also be charged via the built-in solar panel. However, since the charging speed is affected by the sunlight intensity and the conversion rate of the panel, it takes a long time to fully charge. Solar charging is for emergency use only. It is an additional feature and not the main input. Therefore, it is recommended that you use an adapter with a power above 5V2.1A to charge the solar charger for daily use.